Hi,

The Timesheet timer is implemented in the module hr_timesheet. The Start/Stop buttons call methods on the model account.analytic.line:action_timer_start() → starts the timer.action_timer_stop() → stops the timer and calculates duration. Those are the methods you need to inherit/extend.

Code:

from odoo import models, fields, api

from datetime import datetime

class AccountAnalyticLine(models.Model):

    _inherit = "account.analytic.line"

    start_time = fields.Datetime("Start Time")

    end_time = fields.Datetime("End Time")

    def action_timer_start(self):

        """Extend standard start timer to log exact start time"""

        res = super().action_timer_start()

        for line in self:

            line.start_time = fields.Datetime.now()

            line.end_time = False  # reset until stopped

        return res

    def action_timer_stop(self):

        """Extend standard stop timer to log exact end time"""

        res = super().action_timer_stop()

        for line in self:

            line.end_time = fields.Datetime.now()

        return res

Hope it helps.