How to get a person's age from his date of birth in Odoo?

Question

In my module I have an entity "Person" with two fields "date_of_birth" (Date) and "age" (Integer). How can I get the age of a Person from the date of birth and give that value to the age field?

[Age from birthdate in python](https://stackoverflow.com/questions/2217488/age-from-birthdate-in-python) — Kenly, May 11 '20 at 00:45
Does this answer your question? [Age from birthdate in python](https://stackoverflow.com/questions/2217488/age-from-birthdate-in-python) — Gino Mempin, May 11 '20 at 04:17

score 2 · Accepted Answer · answered May 11 '20 at 00:23

Dates are complicated. If you subtract two dates from each other (assuming datetime.date) you get a timedelta consisting of a number of days. Because of leap years you can't reliably calculate number of years from that. By dividing by 365.25, you get a number of years that's correct in most cases. But most cases is usually not acceptable.

Instead, you should calculate year difference, offset by -1 if the person has not had their birthday in the current year.

from datetime import date

def get_age(date_of_birth: date) -> int:
    today = date.today()
    offset = int(date_of_birth.replace(year=today.year) > today)  # int(True) == 1, int(False) == 0
    return date.today().year - date_of_birth.year - offset

Tests

# On 2020-05-11
get_age(date(2020, 5, 11))
>>> 0
get_age(date(2020, 5, 12))
>>> -1
get_age(date(2000, 5, 11))
>>> 20
get_age(date(2000, 5, 12))
>>> 19

score 0 · Answer 2 · edited May 11 '20 at 01:11

0

The datetime.timedelta() function will do it.

edited May 11 '20 at 01:11

Johnny

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answered May 11 '20 at 00:27

How to get a person's age from his date of birth in Odoo?

2 Answers2