How to Get the Last Day of Any Month in Python?

Get the Last Day of the Month in Python

Python provides a straightforward method to determine the last day of a given month using its standard library. The calendar module offers a function called calendar.monthrange that returns two pieces of information: the weekday of the first day of the month and the number of days in that month.

To obtain the last day of a month, simply access the second element of the tuple returned by calendar.monthrange:

last_day = calendar.monthrange(year, month)[1]

Here are a few examples to illustrate its usage:

>>> import calendar
>>> calendar.monthrange(2002, 1)
(6, 31)  # Tuesday, 31 days in January

>>> calendar.monthrange(2008, 2)
(4, 29)  # Friday, 29 days in a leap year's February

>>> calendar.monthrange(2100, 2)
(0, 28)  # Monday, 28 days in a non-leap year's February

The calendar module handles leap years correctly, as demonstrated in the second example. It also supports both past and future dates, as well as pre-Georgian calendars. However, for Python versions prior to 3.12, the weekday is displayed as an integer in the interactive Python shell, as seen in the last example.

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