Python program to calculate age in year

Generally, the age of a person is calculated by subtracting the birth year from the current year. In Python, we can calculate age more precisely using modules like datetime, dateutil, and timedelta to handle dates properly.

Basic Age Calculation

The simplest approach uses basic arithmetic ?

Current year - Birth year

Example

This example implements the basic method by passing current year and birth year to a function ?

def age_calculator(current_year, birth_year):
    age = current_year - birth_year
    print("The age of the person in years is", age, "years")

age_calculator(2023, 1995)

The age of the person in years is 28 years

However, this method doesn't account for whether the birthday has occurred this year. Let's explore more accurate methods.

Using datetime Module

The datetime module provides date.today() to get the current date and calculate age more accurately by considering the birth month and day ?

import datetime

birthdate = "14-05-1991"
day, month, year = map(int, birthdate.split("-"))
today = datetime.date.today()

# Check if birthday has occurred this year
age = today.year - year - ((today.month, today.day) < (month, day))
print("Your age is", age, "years.")

Your age is 32 years.

Using dateutil relativedelta

The dateutil module provides relativedelta() function to calculate the exact difference between two dates ?

from dateutil.relativedelta import relativedelta
import datetime

birthdate = "22-01-1995"
birthdate = datetime.datetime.strptime(birthdate, '%d-%m-%Y').date()
today = datetime.date.today()

age = relativedelta(today, birthdate).years
print("Your age is", age, "years.")

Your age is 28 years.

Using timedelta Function

The timedelta() function calculates the number of days between two dates and divides by the average days per year (365.2425) ?

import datetime

def age_calculator(birthdate):
    today = datetime.date.today()
    age = (today - birthdate) // datetime.timedelta(days=365.2425)
    return age

birthdate = datetime.date(1991, 5, 14)
age = age_calculator(birthdate)
print("The age of the person in years is", age, "years")

The age of the person in years is 32 years

Comparison

Conclusion

Use the datetime module for most age calculations as it accounts for birth month and day. For more complex date operations, use dateutil.relativedelta which provides the most readable and accurate results.