How to Determine the Week Number of a Date in Python?

Determining the Week Number in Python

Finding out the week number of a specific date, such as June 16th (week 24), can be achieved with Python's datetime module.

SOLUTION:

The datetime.date class provides an instance method called isocalendar(). When invoked on a specified date, it returns a tuple containing the following information:

• Year
• Week number
• Weekday

EXAMPLE:

To obtain the week number for June 16th, execute the following code:

<code class="python">>>> import datetime
>>> datetime.date(2010, 6, 16).isocalendar()[1]
24</code>

This will output 24, indicating that June 16th belongs to the 24th week of the year.

PYTHON 3.9 ENHANCEMENT:

In Python 3.9 and higher, isocalendar() returns a namedtuple with specific fields:

• year
• week
• weekday

This allows for more convenient access to the week number:

<code class="python">>>> import datetime
>>> iso = datetime.date(2010, 6, 16).isocalendar()
>>> iso.week
24</code>

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