How to Get the Week Number for a Specific Date in Python?

Retrieving Week Number in Python

Obtaining the current week number for a given date is a common task in programming. In Python, several methods can be employed to accomplish this.

datetime.date.isocalendar() Method

The datetime.date object provides the isocalendar() method, which returns a tuple containing the year, week number, and weekday for the specified date. To find the week number for a particular date, simply invoke the isocalendar() method on the corresponding datetime.date object.

For instance, to determine the week number for June 16th of the current year:

<code class="python">import datetime
date_obj = datetime.date(2023, 6, 16)
week_number = date_obj.isocalendar()[1]
print(week_number)  # Output: 24</code>

In Python 3.9 and above, isocalendar() returns a namedtuple with fields for year, week, and weekday, allowing you to access the week number directly:

<code class="python">import datetime
date_obj = datetime.date(2023, 6, 16)
week_number = date_obj.isocalendar().week
print(week_number)  # Output: 24</code>

Other Methods

Alternatively, there are third-party libraries like dateutil that provide additional methods for manipulating date and time:

<code class="python">from dateutil.relativedelta import relativedelta
date_obj = datetime.date(2023, 6, 16)
week_number = date_obj + relativedelta(weekday=relativedelta.MO(-1))
print(week_number.isocalendar()[1])  # Output: 24</code>

By utilizing these methods, you can easily retrieve the week number for any given date in Python.

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