Hello Ahmed Naji,

You should try this for get employee spends days in company with 2 way depends on data.

Option 1)
If you create new functionality with a fresh database or you don't have any records in the employee, then you can calculate days such a way like below.

from datetime import date

hiring_date = fields.Date(string='Hiring Date' , default=lambda self: date.today())
spend_day = fields.Integer('Spend Days', compute='_compute_days')

def _compute_days(self):
for record in self:
record.spend_day = (date.today() - record.hiring_date).days

Option 2)
If you are using database with already employee data, then you can calculate days such a way like below.

from datetime import date

hiring_date = fields.Date(string='Hiring Date')
spend_day = fields.Integer('Spend Days', compute='_compute_days')

def _compute_days(self):
for record in self:
record.spend_day = (date.today() - record.hiring_date).days if record.hiring_date else 0

Thanks & Regards,

Email: odoo@aktivsoftware.com

Skype: kalpeshmaheshwari

Hi Ahmed, 

What was the solution you found? 

Thank you for everyone try to help 

I solve this by myself.