Hello faizan,

Hope you are doing well.

You can calculate working days using the compute method

write you code like this.

from datetime import date

    employee_join_date = fields.Datetime(string='Employee Start Date')

    employee_end_date = fields.Datetime(string='Employee End Date')

    workdays = fields.Integer(string='Employee Working Days',compute='compute_calculate_workday')

    @api.depends('employee_end_date','employee_end_date')

    def compute_calculate_workday(self):

        for rec in self:

            rec.workdays = (rec.employee_join_date - rec.employee_end_date).days

I Hope this information proves helpful to you.

Thanks & Regards,

Email:   odoo@aktivsoftware.com           

Skype: kalpeshmaheshwari 

hope you find out the anwser