[IMP] project: add recurring tasks

Some interventions are done on a regular basis (e.g. maintenance of
fire alarms, safety inspections). Having tasks auto-generate would
facilitate the process and would ensure that the next intervention
isn't missed/forgotten.

closes odoo/odoo#55517

Taskid: 2172156
Related: odoo/enterprise#12246
Related: odoo/upgrade#1604
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

17 files changed, 1020 insertions, 4 deletions

diff --git a/addons/project/__manifest__.py b/addons/project/__manifest__.py
index 34a7624b63b..f17fe39a0ec 100644
--- a/addons/project/__manifest__.py
+++ b/addons/project/__manifest__.py
@@ -40,6 +40,7 @@
         'wizard/project_task_type_delete_views.xml',
     ],
     'demo': ['data/project_demo.xml'],
+    'qweb': ['static/src/xml/project_templates.xml'],
     'test': [
     ],
     'installable': True,
diff --git a/addons/project/data/project_data.xml b/addons/project/data/project_data.xml
index 63c31fe3775..6c17952e3f5 100644
--- a/addons/project/data/project_data.xml
+++ b/addons/project/data/project_data.xml
@@ -10,6 +10,16 @@
             <field name="numbercall">-1</field>
         </record>
 
+        <record id="ir_cron_recurring_tasks" model="ir.cron">
+            <field name="name">Project: Create Recurring Tasks</field>
+            <field name="model_id" ref="project.model_project_task_recurrence"/>
+            <field name="state">code</field>
+            <field name="code">model._cron_create_recurring_tasks()</field>
+            <field name="interval_type">days</field>
+            <field name="numbercall">-1</field>
+            <field name="nextcall" eval="(DateTime.now().replace(hour=3, minute=0) + timedelta(days=1)).strftime('%Y-%m-%d %H:%M:%S')" />
+        </record>
+
         <!-- Task-related subtypes for messaging / Chatter -->
         <record id="mt_task_new" model="mail.message.subtype">
             <field name="name">Task Created</field>
diff --git a/addons/project/models/__init__.py b/addons/project/models/__init__.py
index 22a31e4bc71..ff2853f7df7 100644
--- a/addons/project/models/__init__.py
+++ b/addons/project/models/__init__.py
@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import analytic_account
+from . import project_task_recurrence
 from . import project
 from . import res_config_settings
 from . import res_partner
diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 00ccd6dc760..325c446ae59 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -2,13 +2,15 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 import ast
-from datetime import timedelta
+from datetime import timedelta, datetime
 from random import randint
 
 from odoo import api, fields, models, tools, SUPERUSER_ID, _
 from odoo.exceptions import UserError, AccessError, ValidationError, RedirectWarning
-from odoo.tools.misc import format_date
+from odoo.tools.misc import format_date, get_lang
+from odoo.osv.expression import OR
 
+from .project_task_recurrence import DAYS, WEEKS
 
 class ProjectTaskType(models.Model):
     _name = 'project.task.type'
@@ -210,6 +212,7 @@ class Project(models.Model):
     subtask_project_id = fields.Many2one('project.project', string='Sub-task Project', ondelete="restrict",
         help="Project in which sub-tasks of the current project will be created. It can be the current project itself.")
     allow_subtasks = fields.Boolean('Sub-tasks', default=lambda self: self.env.user.has_group('project.group_subtask_project'))
+    allow_recurring_tasks = fields.Boolean('Recurring Tasks', default=lambda self: self.env.user.has_group('project.group_project_recurring_tasks'))
 
     # rating fields
     rating_request_deadline = fields.Datetime(compute='_compute_rating_request_deadline', store=True)
@@ -339,6 +342,9 @@ class Project(models.Model):
                 for task in project.task_ids:
                     task.allowed_user_ids -= permission_removed
 
+        if 'allow_recurring_tasks' in vals and not vals.get('allow_recurring_tasks'):
+            self.env['project.task'].search([('project_id', 'in', self.ids), ('recurring_task', '=', True)]).write({'recurring_task': False})
+
         if 'active' in vals:
             # archiving/unarchiving a project does it on its tasks, too
             self.with_context(active_test=False).mapped('tasks').write({'active': vals['active']})
@@ -596,6 +602,172 @@ class Task(models.Model):
     # customer portal: include comment and incoming emails in communication history
     website_message_ids = fields.One2many(domain=lambda self: [('model', '=', self._name), ('message_type', 'in', ['email', 'comment'])])
 
+    # recurrence fields
+    allow_recurring_tasks = fields.Boolean(related='project_id.allow_recurring_tasks')
+    recurring_task = fields.Boolean(string="Recurrent")
+    recurring_count = fields.Integer(string="Tasks in Recurrence", compute='_compute_recurring_count')
+    recurrence_id = fields.Many2one('project.task.recurrence', copy=False)
+    recurrence_update = fields.Selection([
+        ('this', 'This task'),
+        ('subsequent', 'This and following tasks'),
+        ('all', 'All tasks'),
+    ], default='this', store=False)
+    recurrence_message = fields.Char(string='Next Recurrencies', compute='_compute_recurrence_message')
+
+    repeat_interval = fields.Integer(string='Repeat Every', default=1, compute='_compute_repeat', readonly=False)
+    repeat_unit = fields.Selection([
+        ('day', 'Days'),
+        ('week', 'Weeks'),
+        ('month', 'Months'),
+        ('year', 'Years'),
+    ], default='week', compute='_compute_repeat', readonly=False)
+    repeat_type = fields.Selection([
+        ('forever', 'Forever'),
+        ('until', 'End Date'),
+        ('after', 'Number of Repetitions'),
+    ], default="forever", string="Until", compute='_compute_repeat', readonly=False)
+    repeat_until = fields.Date(string="End Date", compute='_compute_repeat', readonly=False)
+    repeat_number = fields.Integer(string="Repetitions", default=1, compute='_compute_repeat', readonly=False)
+
+    repeat_on_month = fields.Selection([
+        ('date', 'Date of the Month'),
+        ('day', 'Day of the Month'),
+    ], default='date', compute='_compute_repeat', readonly=False)
+
+    repeat_on_year = fields.Selection([
+        ('date', 'Date of the Year'),
+        ('day', 'Day of the Year'),
+    ], default='date', compute='_compute_repeat', readonly=False)
+
+    mon = fields.Boolean(string="Mon", compute='_compute_repeat', readonly=False)
+    tue = fields.Boolean(string="Tue", compute='_compute_repeat', readonly=False)
+    wed = fields.Boolean(string="Wed", compute='_compute_repeat', readonly=False)
+    thu = fields.Boolean(string="Thu", compute='_compute_repeat', readonly=False)
+    fri = fields.Boolean(string="Fri", compute='_compute_repeat', readonly=False)
+    sat = fields.Boolean(string="Sat", compute='_compute_repeat', readonly=False)
+    sun = fields.Boolean(string="Sun", compute='_compute_repeat', readonly=False)
+
+    repeat_day = fields.Selection([
+        (str(i), str(i)) for i in range(1, 32)
+    ], compute='_compute_repeat', readonly=False)
+    repeat_week = fields.Selection([
+        ('first', 'First'),
+        ('second', 'Second'),
+        ('third', 'Third'),
+        ('last', 'Last'),
+    ], default='first', compute='_compute_repeat', readonly=False)
+    repeat_weekday = fields.Selection([
+        ('mon', 'Monday'),
+        ('tue', 'Tuesday'),
+        ('wed', 'Wednesday'),
+        ('thu', 'Thursday'),
+        ('fri', 'Friday'),
+        ('sat', 'Saturday'),
+        ('sun', 'Sunday'),
+    ], string='Day Of The Week', compute='_compute_repeat', readonly=False)
+    repeat_month = fields.Selection([
+        ('january', 'January'),
+        ('february', 'February'),
+        ('march', 'March'),
+        ('april', 'April'),
+        ('may', 'May'),
+        ('june', 'June'),
+        ('july', 'July'),
+        ('august', 'August'),
+        ('september', 'September'),
+        ('october', 'October'),
+        ('november', 'November'),
+        ('december', 'December'),
+    ], compute='_compute_repeat', readonly=False)
+
+    repeat_show_dow = fields.Boolean(compute='_compute_repeat_visibility')
+    repeat_show_day = fields.Boolean(compute='_compute_repeat_visibility')
+    repeat_show_week = fields.Boolean(compute='_compute_repeat_visibility')
+    repeat_show_month = fields.Boolean(compute='_compute_repeat_visibility')
+
+    @api.model
+    def _get_recurrence_fields(self):
+        return ['repeat_interval', 'repeat_unit', 'repeat_type', 'repeat_until', 'repeat_number',
+                'repeat_on_month', 'repeat_on_year', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat',
+                'sun', 'repeat_day', 'repeat_week', 'repeat_month', 'repeat_weekday']
+
+    @api.depends('recurring_task', 'repeat_unit', 'repeat_on_month', 'repeat_on_year')
+    def _compute_repeat_visibility(self):
+        for task in self:
+            task.repeat_show_day = task.recurring_task and (task.repeat_unit == 'month' and task.repeat_on_month == 'date') or (task.repeat_unit == 'year' and task.repeat_on_year == 'date')
+            task.repeat_show_week = task.recurring_task and (task.repeat_unit == 'month' and task.repeat_on_month == 'day') or (task.repeat_unit == 'year' and task.repeat_on_year == 'day')
+            task.repeat_show_dow = task.recurring_task and task.repeat_unit == 'week'
+            task.repeat_show_month = task.recurring_task and task.repeat_unit == 'year'
+
+    @api.depends('recurring_task', 'repeat_unit')
+    def _compute_repeat(self):
+        rec_fields = self._get_recurrence_fields()
+        defaults = self.default_get(rec_fields)
+        for task in self:
+            for f in rec_fields:
+                if task.recurrence_id:
+                    task[f] = task.recurrence_id[f]
+                else:
+                    if task.recurring_task:
+                        task[f] = defaults.get(f)
+                    else:
+                        task[f] = False
+
+    def _get_weekdays(self, n=1):
+        self.ensure_one()
+        if self.repeat_unit == 'week':
+            return [fn(n) for day, fn in DAYS.items() if self[day]]
+        return [DAYS.get(self.repeat_weekday)(n)]
+
+    @api.depends(
+        'recurring_task', 'repeat_interval', 'repeat_unit', 'repeat_type', 'repeat_until',
+        'repeat_number', 'repeat_on_month', 'repeat_on_year', 'mon', 'tue', 'wed', 'thu', 'fri',
+        'sat', 'sun', 'repeat_day', 'repeat_week', 'repeat_month', 'repeat_weekday')
+    def _compute_recurrence_message(self):
+        self.recurrence_message = False
+        for task in self.filtered(lambda t: t.recurring_task and t._is_recurrence_valid()):
+            date = fields.Date.today()
+            number_occurrences = min(5, task.repeat_number if task.repeat_type == 'after' else 5)
+            delta = task.repeat_interval if task.repeat_unit == 'day' else 1
+            recurring_dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+                date + timedelta(days=delta),
+                task.repeat_interval,
+                task.repeat_unit,
+                task.repeat_type,
+                task.repeat_until,
+                task.repeat_on_month,
+                task.repeat_on_year,
+                task._get_weekdays(WEEKS.get(task.repeat_week)),
+                task.repeat_day,
+                task.repeat_week,
+                task.repeat_month,
+                count=number_occurrences)
+            date_format = self.env['res.lang']._lang_get(self.env.user.lang).date_format
+            task.recurrence_message = '<ul>'
+            for date in recurring_dates[:5]:
+                task.recurrence_message += '<li>%s</li>' % date.strftime(date_format)
+            if task.repeat_type == 'after' and task.repeat_number > 5 or task.repeat_type == 'forever' or len(recurring_dates) > 5:
+                task.recurrence_message += '<li>...</li>'
+            task.recurrence_message += '</ul>'
+            if task.repeat_type == 'until':
+                task.recurrence_message += _('<p><em>Number of tasks: %(tasks_count)s</em></p>') % {'tasks_count': len(recurring_dates)}
+
+    def _is_recurrence_valid(self):
+        self.ensure_one()
+        return self.repeat_interval > 0 and\
+                (not self.repeat_show_dow or self._get_weekdays()) and\
+                (self.repeat_type != 'after' or self.repeat_number) and\
+                (self.repeat_type != 'until' or self.repeat_until and self.repeat_until > fields.Date.today())
+
+    @api.depends('recurrence_id')
+    def _compute_recurring_count(self):
+        self.recurring_count = 0
+        recurring_tasks = self.filtered(lambda l: l.recurrence_id)
+        count = self.env['project.task'].read_group([('recurrence_id', 'in', recurring_tasks.recurrence_id.ids)], ['id'], 'recurrence_id')
+        tasks_count = {c.get('recurrence_id')[0]: c.get('recurrence_id_count') for c in count}
+        for task in recurring_tasks:
+            task.recurring_count = tasks_count.get(task.recurrence_id.id, 0)
+
     @api.depends('partner_id.email')
     def _compute_partner_email(self):
         for task in self:
@@ -759,6 +931,8 @@ class Task(models.Model):
             default = {}
         if not default.get('name'):
             default['name'] = _("%s (copy)", self.name)
+        if self.recurrence_id:
+            default['recurrence_id'] = self.recurrence_id.copy().id
         return super(Task, self).copy(default)
 
     @api.constrains('parent_id')
@@ -821,6 +995,25 @@ class Task(models.Model):
     # ------------------------------------------------
     # CRUD overrides
     # ------------------------------------------------
+    @api.model
+    def default_get(self, default_fields):
+        vals = super(Task, self).default_get(default_fields)
+
+        days = list(DAYS.keys())
+        week_start = fields.Datetime.today().weekday()
+
+        if all([d in default_fields for d in days]):
+            vals[days[week_start]] = True
+        if 'repeat_day' in default_fields:
+            vals['repeat_day'] = str(fields.Datetime.today().day)
+        if 'repeat_month' in default_fields:
+            vals['repeat_month'] = self._fields.get('repeat_month').selection[fields.Datetime.today().month - 1][0]
+        if 'repeat_until' in default_fields:
+            vals['repeat_until'] = fields.Date.today() + timedelta(days=7)
+        if 'repeat_weekday' in default_fields:
+            vals['repeat_weekday'] = self._fields.get('repeat_weekday').selection[week_start][0]
+
+        return vals
 
     @api.model_create_multi
     def create(self, vals_list):
@@ -847,12 +1040,22 @@ class Task(models.Model):
             if vals.get('stage_id'):
                 vals.update(self.update_date_end(vals['stage_id']))
                 vals['date_last_stage_update'] = fields.Datetime.now()
+            # recurrence
+            rec_fields = vals.keys() & self._get_recurrence_fields()
+            if rec_fields and vals.get('recurring_task') is True:
+                rec_values = {rec_field: vals[rec_field] for rec_field in rec_fields}
+                rec_values['next_recurrence_date'] = fields.Datetime.today()
+                recurrence = self.env['project.task.recurrence'].create(rec_values)
+                vals['recurrence_id'] = recurrence.id
         return super().create(vals_list)
 
     def write(self, vals):
         now = fields.Datetime.now()
         if 'parent_id' in vals and vals['parent_id'] in self.ids:
             raise UserError(_("Sorry. You can't set a task as its parent task."))
+        if 'active' in vals and not vals.get('active') and any(self.mapped('recurrence_id')):
+            # TODO: show a dialog to stop the recurrence
+            raise UserError(_('You cannot archive recurring tasks. Please, disable the recurrence first.'))
         # stage change: update date_last_stage_update
         if 'stage_id' in vals:
             vals.update(self.update_date_end(vals['stage_id']))
@@ -864,7 +1067,33 @@ class Task(models.Model):
         if vals.get('user_id') and 'date_assign' not in vals:
             vals['date_assign'] = now
 
-        result = super(Task, self).write(vals)
+        # recurrence fields
+        rec_fields = vals.keys() & self._get_recurrence_fields()
+        if rec_fields:
+            rec_values = {rec_field: vals[rec_field] for rec_field in rec_fields}
+            for task in self:
+                if task.recurrence_id:
+                    task.recurrence_id.write(rec_values)
+                elif vals.get('recurring_task'):
+                    rec_values['next_recurrence_date'] = fields.Datetime.today()
+                    recurrence = self.env['project.task.recurrence'].create(rec_values)
+                    task.recurrence_id = recurrence.id
+
+        if 'recurring_task' in vals and not vals.get('recurring_task'):
+            self.recurrence_id.unlink()
+
+        tasks = self
+        recurrence_update = vals.pop('recurrence_update', 'this')
+        if recurrence_update != 'this':
+            recurrence_domain = []
+            if recurrence_update == 'subsequent':
+                for task in self:
+                    recurrence_domain = OR([recurrence_domain, ['&', ('recurrence_id', '=', task.recurrence_id.id), ('create_date', '>=', task.create_date)]])
+            else:
+                recurrence_domain = [('recurrence_id', 'in', self.recurrence_id.ids)]
+            tasks |= self.env['project.task'].search(recurrence_domain)
+
+        result = super(Task, tasks).write(vals)
         # rating on stage
         if 'stage_id' in vals and vals.get('stage_id'):
             self.filtered(lambda x: x.project_id.rating_status == 'stage')._send_task_rating_mail(force_send=True)
@@ -876,6 +1105,12 @@ class Task(models.Model):
             return {'date_end': fields.Datetime.now()}
         return {'date_end': False}
 
+    def unlink(self):
+        if any(self.mapped('recurrence_id')):
+            # TODO: show a dialog to stop the recurrence
+            raise UserError(_('You cannot delete recurring tasks. Please, disable the recurrence first.'))
+        return super().unlink()
+
     # ---------------------------------------------------
     # Subtasks
     # ---------------------------------------------------
@@ -1106,6 +1341,15 @@ class Task(models.Model):
 
         return action
 
+    def action_recurring_tasks(self):
+        return {
+            'name': 'Tasks in Recurrence',
+            'type': 'ir.actions.act_window',
+            'res_model': 'project.task',
+            'view_mode': 'tree,form',
+            'domain': [('recurrence_id', 'in', self.recurrence_id.ids)],
+        }
+
     # ---------------------------------------------------
     # Rating business
     # ---------------------------------------------------
diff --git a/addons/project/models/project_task_recurrence.py b/addons/project/models/project_task_recurrence.py
new file mode 100644
index 00000000000..1e00dccce1d
--- /dev/null
+++ b/addons/project/models/project_task_recurrence.py
@@ -0,0 +1,258 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+from calendar import monthrange
+from dateutil.relativedelta import relativedelta
+from dateutil.rrule import rrule, rruleset, DAILY, WEEKLY, MONTHLY, YEARLY, MO, TU, WE, TH, FR, SA, SU
+
+MONTHS = {
+    'january': 31,
+    'february': 28,
+    'march': 31,
+    'april': 30,
+    'may': 31,
+    'june': 30,
+    'july': 31,
+    'august': 31,
+    'september': 30,
+    'october': 31,
+    'november': 30,
+    'december': 31,
+}
+
+DAYS = {
+    'mon': MO,
+    'tue': TU,
+    'wed': WE,
+    'thu': TH,
+    'fri': FR,
+    'sat': SA,
+    'sun': SU,
+}
+
+WEEKS = {
+    'first': 1,
+    'second': 2,
+    'third': 3,
+    'last': 4,
+}
+
+class ProjectTaskRecurrence(models.Model):
+    _name = 'project.task.recurrence'
+    _description = 'Task Recurrence'
+
+    task_ids = fields.One2many('project.task', 'recurrence_id')
+    next_recurrence_date = fields.Date()
+    recurrence_left = fields.Integer(string="Number of tasks left to create")
+
+    repeat_interval = fields.Integer(string='Repeat Every', default=1)
+    repeat_unit = fields.Selection([
+        ('day', 'Days'),
+        ('week', 'Weeks'),
+        ('month', 'Months'),
+        ('year', 'Years'),
+    ], default='week')
+    repeat_type = fields.Selection([
+        ('forever', 'Forever'),
+        ('until', 'End Date'),
+        ('after', 'Number of Repetitions'),
+    ], default="forever", string="Until")
+    repeat_until = fields.Date(string="End Date")
+    repeat_number = fields.Integer(string="Repetitions")
+
+    repeat_on_month = fields.Selection([
+        ('date', 'Date of the Month'),
+        ('day', 'Day of the Month'),
+    ])
+
+    repeat_on_year = fields.Selection([
+        ('date', 'Date of the Year'),
+        ('day', 'Day of the Year'),
+    ])
+
+    mon = fields.Boolean(string="Mon")
+    tue = fields.Boolean(string="Tue")
+    wed = fields.Boolean(string="Wed")
+    thu = fields.Boolean(string="Thu")
+    fri = fields.Boolean(string="Fri")
+    sat = fields.Boolean(string="Sat")
+    sun = fields.Boolean(string="Sun")
+
+    repeat_day = fields.Selection([
+        (str(i), str(i)) for i in range(1, 32)
+    ])
+    repeat_week = fields.Selection([
+        ('first', 'First'),
+        ('second', 'Second'),
+        ('third', 'Third'),
+        ('last', 'Last'),
+    ])
+    repeat_weekday = fields.Selection([
+        ('mon', 'Monday'),
+        ('tue', 'Tuesday'),
+        ('wed', 'Wednesday'),
+        ('thu', 'Thursday'),
+        ('fri', 'Friday'),
+        ('sat', 'Saturday'),
+        ('sun', 'Sunday'),
+    ], string='Day Of The Week', readonly=False)
+    repeat_month = fields.Selection([
+        ('january', 'January'),
+        ('february', 'February'),
+        ('march', 'March'),
+        ('april', 'April'),
+        ('may', 'May'),
+        ('june', 'June'),
+        ('july', 'July'),
+        ('august', 'August'),
+        ('september', 'September'),
+        ('october', 'October'),
+        ('november', 'November'),
+        ('december', 'December'),
+    ])
+
+    @api.constrains('repeat_unit', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun')
+    def _check_recurrence_days(self):
+        for project in self.filtered(lambda p: p.repeat_unit == 'week'):
+            if not any([project.mon, project.tue, project.wed, project.thu, project.fri, project.sat, project.sun]):
+                raise ValidationError('You should select a least one day')
+
+    @api.constrains('repeat_interval')
+    def _check_repeat_interval(self):
+        if self.filtered(lambda t: t.repeat_interval <= 0):
+            raise ValidationError('The interval should be greater than 0')
+
+    @api.constrains('repeat_number', 'repeat_type')
+    def _check_repeat_number(self):
+        if self.filtered(lambda t: t.repeat_type == 'after' and t.repeat_number <= 0):
+            raise ValidationError('Should repeat at least once')
+
+    @api.constrains('repeat_type', 'repeat_until')
+    def _check_repeat_until_date(self):
+        today = fields.Date.today()
+        if self.filtered(lambda t: t.repeat_type == 'until' and t.repeat_until < today):
+            raise ValidationError('The end date should be in the future')
+
+    @api.constrains('repeat_unit', 'repeat_on_month', 'repeat_day', 'repeat_type', 'repeat_until')
+    def _check_repeat_until_month(self):
+        if self.filtered(lambda r: r.repeat_type == 'until' and r.repeat_unit == 'month' and r.repeat_until and r.repeat_on_month == 'date' and int(r.repeat_day) > r.repeat_until.day):
+            raise ValidationError('The end date should be after the day of the month')
+
+    @api.model
+    def _get_recurring_fields(self):
+        return ['allowed_user_ids', 'company_id', 'description', 'displayed_image_id', 'email_cc',
+                'parent_id', 'partner_email', 'partner_id', 'partner_phone', 'planned_hours',
+                'project_id', 'project_privacy_visibility', 'sequence', 'tag_ids', 'recurrence_id',
+                'name', 'recurring_task']
+
+    def _get_weekdays(self, n=1):
+        self.ensure_one()
+        if self.repeat_unit == 'week':
+            return [fn(n) for day, fn in DAYS.items() if self[day]]
+        return [DAYS.get(self.repeat_weekday)(n)]
+
+    @api.model
+    def _get_next_recurring_dates(self, date_start, repeat_interval, repeat_unit, repeat_type, repeat_until, repeat_on_month, repeat_on_year, weekdays, repeat_day, repeat_week, repeat_month, **kwargs):
+        count = kwargs.get('count', 1)
+        rrule_kwargs = {'interval': repeat_interval or 1, 'dtstart': date_start}
+        repeat_day = int(repeat_day)
+        start = False
+        dates = []
+        if repeat_type == 'until':
+            rrule_kwargs['until'] = repeat_until if repeat_until else fields.Date.today()
+        else:
+            rrule_kwargs['count'] = count
+
+        if repeat_unit == 'week'\
+            or (repeat_unit == 'month' and repeat_on_month == 'day')\
+            or (repeat_unit == 'year' and repeat_on_year == 'day'):
+            rrule_kwargs['byweekday'] = weekdays
+
+        if repeat_unit == 'day':
+            rrule_kwargs['freq'] = DAILY
+        elif repeat_unit == 'month':
+            rrule_kwargs['freq'] = MONTHLY
+            if repeat_on_month == 'date':
+                start = date_start - relativedelta(days=1)
+                if repeat_type == 'until' and repeat_until > date_start:
+                    delta = relativedelta(repeat_until, date_start)
+                    count = delta.years * 12 + delta.months
+                for i in range(count):
+                    start = start.replace(day=min(repeat_day, monthrange(start.year, start.month)[1]))
+                    dates.append(start)
+                    start += relativedelta(months=repeat_interval)
+                return dates
+        elif repeat_unit == 'year':
+            rrule_kwargs['freq'] = YEARLY
+            month = list(MONTHS.keys()).index(repeat_month) + 1
+            rrule_kwargs['bymonth'] = month
+            if repeat_on_year == 'date':
+                rrule_kwargs['bymonthday'] = min(repeat_day, MONTHS.get(repeat_month))
+                rrule_kwargs['bymonth'] = month
+        else:
+            rrule_kwargs['freq'] = WEEKLY
+
+        rules = rrule(**rrule_kwargs)
+        return list(rules) if rules else []
+
+    def _new_task_values(self, task):
+        self.ensure_one()
+        fields_to_copy = self._get_recurring_fields()
+        task_values = task.read(fields_to_copy).pop()
+        create_values = {
+            field: value[0] if isinstance(value, tuple) else value for field, value in task_values.items()
+        }
+        create_values['stage_id'] = task.project_id.type_ids[0].id if task.project_id.type_ids else task.stage_id
+        create_values['user_id'] = False
+        return create_values
+
+    def _create_next_task(self):
+        for recurrence in self:
+            task = self.sudo().task_ids[-1]
+            create_values = recurrence._new_task_values(task)
+            new_task = self.env['project.task'].sudo().create(create_values)
+            if not new_task.parent_id and task.child_ids:
+                children = []
+                # copy the subtasks of the original task
+                for child in task.child_ids:
+                    child_values = self._new_task_values(child)
+                    child_values['parent_id'] = new_task.id
+                    children.append(child_values)
+                self.env['project.task'].create(children)
+
+    def _set_next_recurrence_date(self):
+        today = fields.Date.today()
+        tomorrow = today + relativedelta(days=1)
+        for recurrence in self.filtered(lambda r: r.repeat_type == 'after' and r.recurrence_left > 0 or r.repeat_type == 'until' and r.repeat_until >= today or r.repeat_type == 'forever'):
+            next_date = self._get_next_recurring_dates(tomorrow, recurrence.repeat_interval, recurrence.repeat_unit, recurrence.repeat_type, recurrence.repeat_until, recurrence.repeat_on_month, recurrence.repeat_on_year, recurrence._get_weekdays(), recurrence.repeat_day, recurrence.repeat_week, recurrence.repeat_month, count=1)
+            recurrence.next_recurrence_date = next_date[0] if next_date else False
+
+    def _cron_create_recurring_tasks(self):
+        if not self.env.user.has_group('project.group_project_recurring_tasks'):
+            return
+        today = fields.Date.today()
+        recurring_today = self.search([('next_recurrence_date', '<=', today)])
+        recurring_today._create_next_task()
+        for recurrence in recurring_today.filtered(lambda r: r.repeat_type == 'after'):
+            recurrence.recurrence_left -= 1
+        recurring_today._set_next_recurrence_date()
+
+    def create(self, vals):
+        if vals.get('repeat_number'):
+            vals['recurrence_left'] = vals.get('repeat_number')
+        res = super(ProjectTaskRecurrence, self).create(vals)
+        res._set_next_recurrence_date()
+        return res
+
+    def write(self, vals):
+        if vals.get('repeat_number'):
+            vals['recurrence_left'] = vals.get('repeat_number')
+
+        res = super(ProjectTaskRecurrence, self).write(vals)
+
+        if 'next_recurrence_date' not in vals:
+            self._set_next_recurrence_date()
+        return res
diff --git a/addons/project/models/res_config_settings.py b/addons/project/models/res_config_settings.py
index e63c53edc59..1831c1cd0ca 100644
--- a/addons/project/models/res_config_settings.py
+++ b/addons/project/models/res_config_settings.py
@@ -11,3 +11,9 @@ class ResConfigSettings(models.TransientModel):
     module_hr_timesheet = fields.Boolean(string="Task Logs")
     group_subtask_project = fields.Boolean("Sub-tasks", implied_group="project.group_subtask_project")
     group_project_rating = fields.Boolean("Customer Ratings", implied_group='project.group_project_rating')
+    group_project_recurring_tasks = fields.Boolean("Recurring Tasks", implied_group="project.group_project_recurring_tasks")
+
+    def set_values(self):
+        if self.user_has_groups('project.group_project_recurring_tasks') != self.group_project_recurring_tasks:
+            self.env['project.project'].sudo().search([]).write({'allow_recurring_tasks': self.group_project_recurring_tasks})
+        super(ResConfigSettings, self).set_values()
diff --git a/addons/project/security/ir.model.access.csv b/addons/project/security/ir.model.access.csv
index 53661ef75fc..e4538dbe11b 100644
--- a/addons/project/security/ir.model.access.csv
+++ b/addons/project/security/ir.model.access.csv
@@ -24,3 +24,4 @@ access_account_analytic_account_manager,account.analytic.account,analytic.model_
 access_account_analytic_line_project,account.analytic.line project,analytic.model_account_analytic_line,project.group_project_manager,1,1,1,1
 access_project_delete_wizard,access_project_delete_wizard,model_project_delete_wizard,project.group_project_manager,1,1,1,1
 access_project_task_type_delete_wizard,project.task.type.delete.wizard,model_project_task_type_delete_wizard,project.group_project_manager,1,1,1,1
+access_project_task_recurrence,project.task.recurrence,model_project_task_recurrence,project.group_project_user,1,1,1,1
diff --git a/addons/project/security/project_security.xml b/addons/project/security/project_security.xml
index ead2c9c52d5..befca629ed6 100644
--- a/addons/project/security/project_security.xml
+++ b/addons/project/security/project_security.xml
@@ -29,6 +29,11 @@
         <field name="category_id" ref="base.module_category_hidden"/>
     </record>
 
+    <record id="group_project_recurring_tasks" model="res.groups">
+        <field name="name">Use Recurring Tasks</field>
+        <field name="category_id" ref="base.module_category_hidden"/>
+    </record>
+
 <data noupdate="1">
     <record id="base.default_user" model="res.users">
         <field name="groups_id" eval="[(4,ref('project.group_project_manager'))]"/>
diff --git a/addons/project/static/src/css/project.css b/addons/project/static/src/css/project.css
index 19f265cd2c6..a88d7d1b7b7 100644
--- a/addons/project/static/src/css/project.css
+++ b/addons/project/static/src/css/project.css
@@ -70,3 +70,7 @@
   margin-right: 150px;
   padding-left: 1rem;
 }
+
+.o_form_project_recurrence_message *:last-child {
+  margin-bottom: 0;
+}
diff --git a/addons/project/static/src/scss/project_dashboard.scss b/addons/project/static/src/scss/project_dashboard.scss
index 5e0b0c7da39..73539824e82 100644
--- a/addons/project/static/src/scss/project_dashboard.scss
+++ b/addons/project/static/src/scss/project_dashboard.scss
@@ -37,3 +37,15 @@
     }
 }
 
+.o_dow_widget {
+    th {
+        padding: 10px 10px 0 10px;
+    }
+
+    .o_dow_days {
+        td {
+            text-align: center;
+            vertical-align: middle;
+        }
+    }
+}
diff --git a/addons/project/static/src/xml/project_templates.xml b/addons/project/static/src/xml/project_templates.xml
new file mode 100644
index 00000000000..f30d8c95a0e
--- /dev/null
+++ b/addons/project/static/src/xml/project_templates.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<templates id="template" xml:space="preserve">
+    <t t-name="day_of_week_widget">
+        <table class="o_dow_widget">
+            <thead>
+                <tr>
+                    <th t-foreach="widget.labels" t-as="label">
+                        <t t-esc="label"/>
+                    </th>
+                </tr>
+            </thead>
+            <tbody>
+                <tr class="o_dow_days" />
+            </tbody>
+        </table>
+    </t>
+</templates>
diff --git a/addons/project/tests/__init__.py b/addons/project/tests/__init__.py
index 4b37120321d..aadb3c31f42 100644
--- a/addons/project/tests/__init__.py
+++ b/addons/project/tests/__init__.py
@@ -1,4 +1,4 @@
 # -*- coding: utf-8 -*-
 
-from . import test_project_base, test_project_flow, test_access_rights, test_project_ui
+from . import test_project_base, test_project_flow, test_access_rights, test_project_recurrence, test_project_ui
 from . import test_multicompany
diff --git a/addons/project/tests/test_project_recurrence.py b/addons/project/tests/test_project_recurrence.py
new file mode 100644
index 00000000000..b207e7a9522
--- /dev/null
+++ b/addons/project/tests/test_project_recurrence.py
@@ -0,0 +1,351 @@
+# -*- coding: utf-8 -*-
+
+
+from odoo.tests.common import SavepointCase, Form
+from odoo.exceptions import ValidationError
+from odoo import fields
+
+from datetime import date, datetime
+from dateutil.rrule import MO, TU, WE, TH, FR, SA, SU
+
+from unittest.mock import patch
+
+class TestProjectrecurrence(SavepointCase):
+    @classmethod
+    def setUpClass(cls):
+        super(TestProjectrecurrence, cls).setUpClass()
+
+        cls.env.user.groups_id += cls.env.ref('project.group_project_recurring_tasks')
+
+        cls.stage_a = cls.env['project.task.type'].create({'name': 'a'})
+        cls.stage_b = cls.env['project.task.type'].create({'name': 'b'})
+        cls.project_recurring = cls.env['project.project'].with_context({'mail_create_nolog': True}).create({
+            'name': 'Recurring',
+            'allow_recurring_tasks': True,
+            'type_ids': [
+                (4, cls.stage_a.id),
+                (4, cls.stage_b.id),
+            ]
+        })
+
+    def set_task_create_date(self, task_id, create_date):
+        self.env.cr.execute("UPDATE project_task SET create_date=%s WHERE id=%s", (create_date, task_id))
+
+    def test_recurrence_simple(self):
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 2, 1)):
+            with Form(self.env['project.task']) as form:
+                form.name = 'test recurring task'
+                form.project_id = self.project_recurring
+
+                form.recurring_task = True
+                form.repeat_interval = 5
+                form.repeat_unit = 'month'
+                form.repeat_type = 'after'
+                form.repeat_number = 10
+                form.repeat_on_month = 'date'
+                form.repeat_day = '31'
+            task = form.save()
+            self.assertTrue(bool(task.recurrence_id), 'should create a recurrence')
+
+            task.write(dict(repeat_interval=2, repeat_number=11))
+            self.assertEqual(task.recurrence_id.repeat_interval, 2, 'recurrence should be updated')
+            self.assertEqual(task.recurrence_id.repeat_number, 11, 'recurrence should be updated')
+            self.assertEqual(task.recurrence_id.recurrence_left, 11)
+            self.assertEqual(task.recurrence_id.next_recurrence_date, date(2020, 2, 29))
+
+            task.recurring_task = False
+            self.assertFalse(bool(task.recurrence_id), 'the recurrence should be deleted')
+
+    def test_recurrence_cron(self):
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 1, 1)):
+            form = Form(self.env['project.task'])
+            form.name = 'test recurring task'
+            form.description = 'my super recurring task bla bla bla'
+            form.project_id = self.project_recurring
+            form.date_deadline = datetime(2020, 2, 1)
+
+            form.recurring_task = True
+            form.repeat_interval = 1
+            form.repeat_unit = 'month'
+            form.repeat_type = 'after'
+            form.repeat_number = 2
+            form.repeat_on_month = 'date'
+            form.repeat_day = '15'
+            task = form.save()
+            task.planned_hours = 2
+
+            self.assertEqual(task.recurrence_id.next_recurrence_date, date(2020, 1, 15))
+            self.assertEqual(self.env['project.task'].search_count([('project_id', '=', self.project_recurring.id)]), 1)
+            self.env['project.task.recurrence']._cron_create_recurring_tasks()
+            self.assertEqual(self.env['project.task'].search_count([('project_id', '=', self.project_recurring.id)]), 1, 'no extra task should be created')
+            self.assertEqual(task.recurrence_id.recurrence_left, 2)
+
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 1, 15)):
+            self.assertEqual(self.env['project.task'].search_count([('project_id', '=', self.project_recurring.id)]), 1)
+            self.env['project.task.recurrence']._cron_create_recurring_tasks()
+            self.assertEqual(self.env['project.task'].search_count([('project_id', '=', self.project_recurring.id)]), 2)
+            self.assertEqual(task.recurrence_id.recurrence_left, 1)
+
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 2, 15)):
+            self.env['project.task.recurrence']._cron_create_recurring_tasks()
+            self.assertEqual(task.recurrence_id.recurrence_left, 0)
+
+        tasks = self.env['project.task'].search([('project_id', '=', self.project_recurring.id)])
+        self.assertEqual(len(tasks), 3)
+
+        self.assertTrue(bool(tasks[2].date_deadline))
+        self.assertFalse(tasks[1].date_deadline, "Deadline should not be copied")
+
+        for f in self.env['project.task.recurrence']._get_recurring_fields():
+            self.assertTrue(tasks[0][f] == tasks[1][f] == tasks[2][f], "Field %s should have been copied" % f)
+
+    def test_recurrence_update_task(self):
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 1, 1)):
+            task = self.env['project.task'].create({
+                    'name': 'test recurring task',
+                    'project_id': self.project_recurring.id,
+                    'recurring_task': True,
+                    'repeat_interval': 1,
+                    'repeat_unit': 'week',
+                    'repeat_type': 'after',
+                    'repeat_number': 2,
+                    'mon': True,
+                })
+
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 1, 6)):
+            self.env['project.task.recurrence']._cron_create_recurring_tasks()
+
+        with patch.object(fields.Date, 'today', lambda: datetime(2020, 1, 13)):
+            self.env['project.task.recurrence']._cron_create_recurring_tasks()
+
+        task_c, task_b, task_a = self.env['project.task'].search([('project_id', '=', self.project_recurring.id)])
+
+        self.set_task_create_date(task_a.id, datetime(2020, 1, 1))
+        self.set_task_create_date(task_b.id, datetime(2020, 1, 6))
+        self.set_task_create_date(task_c.id, datetime(2020, 1, 13))
+        (task_a+task_b+task_c).invalidate_cache()
+
+        task_c.write({
+            'name': 'my super updated task',
+            'recurrence_update': 'all',
+        })
+
+        self.assertEqual(task_a.name, 'my super updated task')
+        self.assertEqual(task_b.name, 'my super updated task')
+        self.assertEqual(task_c.name, 'my super updated task')
+
+        task_a.write({
+            'name': 'don\'t you dare change my title',
+            'recurrence_update': 'this',
+        })
+
+        self.assertEqual(task_a.name, 'don\'t you dare change my title')
+        self.assertEqual(task_b.name, 'my super updated task')
+        self.assertEqual(task_c.name, 'my super updated task')
+
+        task_b.write({
+            'description': 'hello!',
+            'recurrence_update': 'subsequent',
+        })
+
+        self.assertEqual(task_a.description, False)
+        self.assertEqual(task_b.description, '<p>hello!</p>')
+        self.assertEqual(task_c.description, '<p>hello!</p>')
+
+    def test_recurrence_fields_visibility(self):
+        form = Form(self.env['project.task'])
+
+        form.name = 'test recurring task'
+        form.project_id = self.project_recurring
+        form.recurring_task = True
+
+        form.repeat_unit = 'week'
+        self.assertTrue(form.repeat_show_dow)
+        self.assertFalse(form.repeat_show_day)
+        self.assertFalse(form.repeat_show_week)
+        self.assertFalse(form.repeat_show_month)
+
+        form.repeat_unit = 'month'
+        form.repeat_on_month = 'date'
+        self.assertFalse(form.repeat_show_dow)
+        self.assertTrue(form.repeat_show_day)
+        self.assertFalse(form.repeat_show_week)
+        self.assertFalse(form.repeat_show_month)
+
+        form.repeat_unit = 'month'
+        form.repeat_on_month = 'day'
+        self.assertFalse(form.repeat_show_dow)
+        self.assertFalse(form.repeat_show_day)
+        self.assertTrue(form.repeat_show_week)
+        self.assertFalse(form.repeat_show_month)
+
+        form.repeat_unit = 'year'
+        form.repeat_on_year = 'date'
+        self.assertFalse(form.repeat_show_dow)
+        self.assertTrue(form.repeat_show_day)
+        self.assertFalse(form.repeat_show_week)
+        self.assertTrue(form.repeat_show_month)
+
+        form.repeat_unit = 'year'
+        form.repeat_on_year = 'day'
+        self.assertFalse(form.repeat_show_dow)
+        self.assertFalse(form.repeat_show_day)
+        self.assertTrue(form.repeat_show_week)
+        self.assertTrue(form.repeat_show_month)
+
+        form.recurring_task = False
+        self.assertFalse(form.repeat_show_dow)
+        self.assertFalse(form.repeat_show_day)
+        self.assertFalse(form.repeat_show_week)
+        self.assertFalse(form.repeat_show_month)
+
+    def test_recurrence_week_day(self):
+        form = Form(self.env['project.task'])
+
+        form.name = 'test recurring task'
+        form.project_id = self.project_recurring
+        form.recurring_task = True
+        form.repeat_unit = 'week'
+
+        form.mon = False
+        form.tue = False
+        form.wed = False
+        form.thu = False
+        form.fri = False
+        form.sat = False
+        form.sun = False
+
+        with self.assertRaises(ValidationError), self.cr.savepoint():
+            form.save()
+
+    def test_recurrence_next_dates_week(self):
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 1, 1),
+            repeat_interval=1,
+            repeat_unit='week',
+            repeat_type=False,
+            repeat_until=False,
+            repeat_on_month=False,
+            repeat_on_year=False,
+            weekdays=False,
+            repeat_day=False,
+            repeat_week=False,
+            repeat_month=False,
+            count=5)
+
+        self.assertEqual(dates[0], datetime(2020, 1, 6, 0, 0))
+        self.assertEqual(dates[1], datetime(2020, 1, 13, 0, 0))
+        self.assertEqual(dates[2], datetime(2020, 1, 20, 0, 0))
+        self.assertEqual(dates[3], datetime(2020, 1, 27, 0, 0))
+        self.assertEqual(dates[4], datetime(2020, 2, 3, 0, 0))
+
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 1, 1),
+            repeat_interval=3,
+            repeat_unit='week',
+            repeat_type='until',
+            repeat_until=date(2020, 2, 1),
+            repeat_on_month=False,
+            repeat_on_year=False,
+            weekdays=[MO, FR],
+            repeat_day=False,
+            repeat_week=False,
+            repeat_month=False,
+            count=100)
+
+        self.assertEqual(len(dates), 3)
+        self.assertEqual(dates[0], datetime(2020, 1, 3, 0, 0))
+        self.assertEqual(dates[1], datetime(2020, 1, 20, 0, 0))
+        self.assertEqual(dates[2], datetime(2020, 1, 24, 0, 0))
+
+    def test_recurrence_next_dates_month(self):
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 1, 15),
+            repeat_interval=1,
+            repeat_unit='month',
+            repeat_type=False, # Forever
+            repeat_until=False,
+            repeat_on_month='date',
+            repeat_on_year=False,
+            weekdays=False,
+            repeat_day=31,
+            repeat_week=False,
+            repeat_month=False,
+            count=12)
+
+        # should take the last day of each month
+        self.assertEqual(dates[0], date(2020, 1, 31))
+        self.assertEqual(dates[1], date(2020, 2, 29))
+        self.assertEqual(dates[2], date(2020, 3, 31))
+        self.assertEqual(dates[3], date(2020, 4, 30))
+        self.assertEqual(dates[4], date(2020, 5, 31))
+        self.assertEqual(dates[5], date(2020, 6, 30))
+        self.assertEqual(dates[6], date(2020, 7, 31))
+        self.assertEqual(dates[7], date(2020, 8, 31))
+        self.assertEqual(dates[8], date(2020, 9, 30))
+        self.assertEqual(dates[9], date(2020, 10, 31))
+        self.assertEqual(dates[10], date(2020, 11, 30))
+        self.assertEqual(dates[11], date(2020, 12, 31))
+
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 2, 20),
+            repeat_interval=3,
+            repeat_unit='month',
+            repeat_type=False, # Forever
+            repeat_until=False,
+            repeat_on_month='date',
+            repeat_on_year=False,
+            weekdays=False,
+            repeat_day=29,
+            repeat_week=False,
+            repeat_month=False,
+            count=5)
+
+        self.assertEqual(dates[0], date(2020, 2, 29))
+        self.assertEqual(dates[1], date(2020, 5, 29))
+        self.assertEqual(dates[2], date(2020, 8, 29))
+        self.assertEqual(dates[3], date(2020, 11, 29))
+        self.assertEqual(dates[4], date(2021, 2, 28))
+
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 1, 10),
+            repeat_interval=1,
+            repeat_unit='month',
+            repeat_type='until',
+            repeat_until=datetime(2020, 5, 31),
+            repeat_on_month='day',
+            repeat_on_year=False,
+            weekdays=[SA(4), ], # 4th Saturday
+            repeat_day=29,
+            repeat_week=False,
+            repeat_month=False,
+            count=6)
+
+        self.assertEqual(len(dates), 5)
+        self.assertEqual(dates[0], datetime(2020, 1, 25))
+        self.assertEqual(dates[1], datetime(2020, 2, 22))
+        self.assertEqual(dates[2], datetime(2020, 3, 28))
+        self.assertEqual(dates[3], datetime(2020, 4, 25))
+        self.assertEqual(dates[4], datetime(2020, 5, 23))
+
+    def test_recurrence_next_dates_year(self):
+        dates = self.env['project.task.recurrence']._get_next_recurring_dates(
+            date_start=date(2020, 12, 1),
+            repeat_interval=1,
+            repeat_unit='year',
+            repeat_type='until',
+            repeat_until=datetime(2026, 1, 1),
+            repeat_on_month=False,
+            repeat_on_year='date',
+            weekdays=False,
+            repeat_day=31,
+            repeat_week=False,
+            repeat_month='november',
+            count=10)
+
+        self.assertEqual(len(dates), 5)
+        self.assertEqual(dates[0], datetime(2021, 11, 30))
+        self.assertEqual(dates[1], datetime(2022, 11, 30))
+        self.assertEqual(dates[2], datetime(2023, 11, 30))
+        self.assertEqual(dates[3], datetime(2024, 11, 30))
+        self.assertEqual(dates[4], datetime(2025, 11, 30))
diff --git a/addons/project/views/project_views.xml b/addons/project/views/project_views.xml
index 25da09f7908..bdc03ae1ae3 100644
--- a/addons/project/views/project_views.xml
+++ b/addons/project/views/project_views.xml
@@ -351,9 +351,21 @@
                                         </div>
                                     </div>
                                 </div>
+                                <div class="col-lg-6 o_setting_box"  id="recurring_tasks_setting" groups="project.group_project_recurring_tasks">
+                                    <div class="o_setting_left_pane">
+                                        <field name="allow_recurring_tasks" />
+                                    </div>
+                                    <div class="o_setting_right_pane">
+                                        <label for="allow_recurring_tasks" />
+                                        <div class="text-muted">
+                                            Auto-generate tasks for regular activities
+                                        </div>
+                                    </div>
+                                </div>
                             </div>
                         </page>
                     </notebook>
+
                     <div class="oe_chatter">
                         <field name="message_follower_ids" options="{'post_refresh':True}" help="Follow this project to automatically track the events associated to tasks and issues of this project." groups="base.group_user"/>
                     </div>
@@ -444,6 +456,7 @@
                         <field name="name" class="o_project_name oe_inline"
                             string="Project Name" placeholder="e.g. Office Party"/>
                         <field name="user_id" invisible="1"/>
+                        <field name="allow_recurring_tasks" groups="project.group_project_recurring_tasks" />
                     </group>
                     <div name="alias_def" colspan="2" attrs="{'invisible': [('alias_domain', '=', False)]}">
                         <label for="alias_enabled" class="oe_inline" string="Create tasks by sending an email to"/>
@@ -607,6 +620,12 @@
                 <form string="Task" class="o_form_project_tasks">
                     <field name="allow_subtasks" invisible="1" />
                     <field name="is_closed" invisible="1" />
+                    <field name="allow_recurring_tasks" invisible="1" />
+                    <field name="repeat_show_dow" invisible="1" />
+                    <field name="repeat_show_day" invisible="1" />
+                    <field name="repeat_show_week" invisible="1" />
+                    <field name="repeat_show_month" invisible="1" />
+                    <field name="recurrence_id" invisible="1" />
                     <header>
                         <button name="action_assign_to_me" string="Assign to Me" type="object" class="oe_highlight"
                             attrs="{'invisible' : [('user_id', '!=', False)]}"/>
@@ -615,6 +634,10 @@
                     <div class="text-center alert alert-primary" role="alert" attrs="{'invisible': ['|', ('ribbon_message', '=', False), ('ribbon_message', '=', '')]}">
                         <field name="ribbon_message"/>
                     </div>
+                    <div class="alert alert-info oe_edit_only" role="status" attrs="{'invisible': ['|', ('recurring_task', '=', False), ('recurrence_id', '=', False)]}">
+                        <p>Edit recurring task</p>
+                        <field name="recurrence_update" widget="radio"/>
+                    </div>
                     <sheet string="Task">
                     <div class="oe_button_box" name="button_box">
                         <button name="action_subtask" type="object" class="oe_stat_button" icon="fa-tasks"
@@ -624,6 +647,15 @@
                         <button name="%(rating_rating_action_task)d" type="action" attrs="{'invisible': [('rating_count', '=', 0)]}" class="oe_stat_button" icon="fa-smile-o" groups="project.group_project_rating">
                             <field name="rating_count" string="Rating" widget="statinfo"/>
                         </button>
+                        <button name="action_recurring_tasks" type="object" attrs="{'invisible': [('recurrence_id', '=', False)]}" class="oe_stat_button" icon="fa-repeat" groups="project.group_project_recurring_tasks">
+                            <div class="o_field_widget o_stat_info">
+                                <span class="o_stat_value">
+                                    <field name="recurring_count" widget="statinfo" nolabel="1" />
+                                    Tasks
+                                </span>
+                                <span class="o_stat_text">in Recurrence</span>
+                            </div>
+                        </button>
                     </div>
                     <widget name="web_ribbon" title="Archived" bg_color="bg-danger" attrs="{'invisible': [('active', '=', True)]}"/>
                     <div class="oe_title pr-0">
@@ -654,6 +686,7 @@
                                 attrs="{'invisible' : [('allow_subtasks', '=', False)]}"
                             />
                             <field name="date_deadline" widget="remaining_days" attrs="{'invisible': [('is_closed', '=', True)]}"/>
+                            <field name="recurring_task" attrs="{'invisible': [('allow_recurring_tasks', '=', False)]}" />
                             <field name="tag_ids" widget="many2many_tags" options="{'color_field': 'color', 'no_create_edit': True}"/>
                         </group>
                     </group>
@@ -662,6 +695,51 @@
                             <field name="description" type="html"/>
                             <div class="oe_clear"/>
                         </page>
+                        <page name="recurrence" string="Recurrence" attrs="{'invisible': [('recurring_task', '=', False)]}">
+                            <group>
+                                <group>
+                                    <label for="repeat_interval" />
+                                    <div class="o_row">
+                                        <field name="repeat_interval" attrs="{'required': [('recurring_task', '=', True)]}" />
+                                        <field name="repeat_unit" attrs="{'required': [('recurring_task', '=', True)]}" />
+                                    </div>
+
+                                    <label for="repeat_on_month" string="Repeat On" attrs="{'invisible': [('repeat_unit', 'not in', ('month', 'year'))]}" />
+                                    <div class="o_row">
+                                        <field name="repeat_on_month" attrs="{'invisible': [('repeat_unit', '!=', 'month')], 'required': [('repeat_unit', '=', 'month')]}" />
+                                        <field name="repeat_on_year" attrs="{'invisible': [('repeat_unit', '!=', 'year')], 'required': [('repeat_unit', '=', 'year')]}" />
+
+                                        <field name="repeat_day" attrs="{'invisible': [('repeat_show_day', '=', False)], 'required': [('repeat_show_day', '=', True)]}" />
+                                        <field name="repeat_week" attrs="{'invisible': [('repeat_show_week', '=', False)], 'required': [('repeat_show_week', '=', True)]}" />
+                                        <field name="repeat_weekday" attrs="{'invisible': [('repeat_show_week', '=', False)], 'required': [('repeat_show_week', '=', True)]}" />
+                                        <span attrs="{'invisible': ['|', ('repeat_show_week', '=', False), ('repeat_show_month', '=', False)]}">of</span>
+                                        <field name="repeat_month" attrs="{'invisible': [('repeat_show_month', '=', False)], 'required': [('repeat_show_month', '=', True)]}" />
+                                    </div>
+
+
+                                    <field name="mon" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="tue" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="wed" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="thu" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="fri" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="sat" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+                                    <field name="sun" attrs="{'invisible': [('repeat_show_dow', '=', False)]}" />
+
+                                    <label for="repeat_type" />
+                                    <div class="o_row">
+                                        <field name="repeat_type" attrs="{'required': [('recurring_task', '=', True)]}" />
+                                        <field name="repeat_until" attrs="{'invisible': [('repeat_type', '!=', 'until')], 'required': [('repeat_type', '=', 'until')]}" />
+                                        <field name="repeat_number" attrs="{'invisible': [('repeat_type', '!=', 'after')], 'required': [('repeat_type', '=', 'after')]}" />
+                                    </div>
+                                </group>
+                            </group>
+                            <group attrs="{'invisible': ['|', ('recurring_task', '=', False), ('recurrence_message', '=', False)]}">
+                                <div class="alert alert-success o_form_project_recurrence_message" role="status">
+                                    <p><span class="fa fa-check-circle"></span> Next Occurrences:</p>
+                                    <field name="recurrence_message" widget="html" class="mb-0" />
+                                </div>
+                            </group>
+                        </page>
                         <page name="extra_info" string="Extra Info" groups="base.group_no_one">
                             <group>
                                 <group>
diff --git a/addons/project/views/res_config_settings_views.xml b/addons/project/views/res_config_settings_views.xml
index 03db2df0758..074cccfd390 100644
--- a/addons/project/views/res_config_settings_views.xml
+++ b/addons/project/views/res_config_settings_views.xml
@@ -49,6 +49,17 @@
                                     </div>
                                 </div>
                             </div>
+                            <div class="col-12 col-lg-6 o_setting_box" id="recurring_tasks_setting">
+                                <div class="o_setting_left_pane">
+                                    <field name="group_project_recurring_tasks"/>
+                                </div>
+                                <div class="o_setting_right_pane">
+                                    <label for="group_project_recurring_tasks"/>
+                                    <div class="text-muted">
+                                        Auto-generate tasks for regular activities
+                                    </div>
+                                </div>
+                            </div>
                         </div>
                         <h2>Time Management</h2>
                         <div class="row mt16 o_settings_container" name="project_time">
diff --git a/addons/sale_project/models/project.py b/addons/sale_project/models/project.py
index e30c3de3f63..d2834b4105a 100644
--- a/addons/sale_project/models/project.py
+++ b/addons/sale_project/models/project.py
@@ -143,3 +143,13 @@ class ProjectTask(models.Model):
         })
         action['context'] = context
         return action
+
+class ProjectTaskRecurrence(models.Model):
+    _inherit = 'project.task.recurrence'
+
+    def _new_task_values(self, task):
+        values = super(ProjectTaskRecurrence, self)._new_task_values(task)
+        task = self.sudo().task_ids[0]
+        if not task.is_fsm:
+            values['sale_line_id'] = task.sale_line_id.id
+        return values
diff --git a/addons/sale_timesheet/models/project.py b/addons/sale_timesheet/models/project.py
index 0e4f2a69cd0..0354d95276f 100644
--- a/addons/sale_timesheet/models/project.py
+++ b/addons/sale_timesheet/models/project.py
@@ -309,3 +309,10 @@ class ProjectTask(models.Model):
 
     def _get_action_view_so_ids(self):
         return list(set((self.sale_order_id + self.timesheet_ids.so_line.order_id).ids))
+
+class ProjectTaskRecurrence(models.Model):
+    _inherit = 'project.task.recurrence'
+
+    @api.model
+    def _get_recurring_fields(self):
+        return ['analytic_account_id'] + super(ProjectTaskRecurrence, self)._get_recurring_fields()