How to calculate age in days from date of birth in Python
This Python tutorial, going to be very interesting as we will learn how to calculate age in days from the date of birth in Python. Just imagine that you know someone’s date of birth and you can create a Python program to know his age in days.
In order to build this program you will need to use the following module:
- datetime module
From this module, we have to import these following two classes:
Python Program to calculate age in days from date of birth
from datetime import datetime, timedelta particular_date = datetime(1996, 1, 1) new_date = datetime.today() - particular_date print (new_date.days)
$ python codespeedy.py 8496
Here we got our result. The age of the person is 8496 days, whose DOB is 1st of January, 1996.
Explanation of this program
Firstly we have imported datetime and timedelta classes from datetime module by the below line of code.
from datetime import datetime, timedelta
datetime module has many classes that can be used to manipulate date and time both in simple as well as complex ways. To read documentation please refer to this link: https://docs.python.org/2/library/datetime.html
particular_date = datetime(1996, 1, 1)
We have stored the date of birth of a person using datetime() in variable particular_date.
The format of the date is year month date here.
datetime.today() returns the current date/system date.
Then we have used “-” operator to subtract date of birth from the current date to get the age from date of birth.
new_date = datetime.today() - particular_date print (new_date.days)
Point to be noted:
If we use print(new_date)
It will give us the output like
8496 days, 12:40:31.093823
So in order to remove the time from days, we have used new_date.days.
It will return only days.
Calculate age from DOB with days, hours, minutes and seconds
from datetime import datetime, timedelta particular_date = datetime(1996, 1, 1) new_date = datetime.today() - particular_date print (new_date)
It will give you the output with days and exact time in microseconds.
Run it on your machine to see the output.
You may also learn, How to subtract days from date in Python