Current age

current_age.py

import datetime

from dateutil import parser


def current_age(birth_date):
    """Return current age for a string or datetime.date birth date."""
    if isinstance(birth_date, datetime.date):
        dob = birth_date
    else:
        dob = parser.parse(birth_date).date()
    today = datetime.date.today()
    this_year = today.year
    try:
        birthday = dob.replace(year=this_year)
    except ValueError:  # raised when dob is Feb 29 in a non-leap year
        birthday = dob.replace(
            year=this_year, day=dob.day - 1)
    if birthday > today:
        return this_year - dob.year - 1
    else:
        return this_year - dob.year