ListenData: Python : Complete Guide to Date and Time Functions

Introduction : datetime module

It is a python module which provides several functions for dealing with dates and time. It has four classes as follows which are explained in the latter part of this article how these classes work.

1. datetime
2. date
3. time
4. timedelta

People who have no experience of working with real-world datasets might have not encountered date columns. They might be under impression that working with dates is rarely used and not so important. To enlighten them, I have listed down real-world examples wherein using datetime module can be beneficial.

1. Selecting all the saving account holders who were active on 30th June, 2018 and checking their status whether they are still active
2. Identifying insureds who filed more than 20 claims in the last 3 months
3. Identifying customers who made multiple transactions in the last 6 months
4. Extracting dates from timestamp values

You can import or load datetime module by using the command below -

import datetime

You don't need to install this module as it comes bundled with the installation of python software.

Dates

Here we are using datetime.date class which is used to represent calendar date values. today() method is used to fetch current date.

datetime.date.today()

Output
datetime.date(2019, 7, 19)

In order to display it like a proper calendar date, we can wrap it within print( ) command.

print(datetime.date.today())

Output
2019-07-19