“%U” corresponds to the calendar where Sunday is considered the first day of the week.īelow is an example of how you can use strftime() to get the week number from a date in Python. “%W” corresponds to the calendar where Monday is considered the first day of the week. You can pass “%W”, “%U”, or “%V” to strftime() to get the number of the week according to three different calendars. The strftime() function allows you to format dates with different date formats. Print(datetime.date(2022, 6, 20).isocalendar().week)Ģ5 Using strftime() to Get Week Number from Date in PythonĪnother way you can get the week number from a date variable in Python is with the strftime() function. If you are using Python 3.9+, then you can access the ‘week’ attribute from isocalendar(). This is called week number 1, and the ISO year of that Thursday is the same as its Gregorian year.īelow is an example of how you can get the week number from a date using Python. The first week of an ISO year is the first (Gregorian) calendar week of a year containing a Thursday. The ISO year consists of 52 or 53 full weeks, and where a week starts on a Monday and ends on a Sunday. The ISO calendar is a widely used variant of the Gregorian calendar. The isocalendar() function returns a tuple object with three components: year, week and weekday. The easiest way to get the week number is to use the Python datetime isocalendar() function. There are a few different ways to get the week number of the year in Python. One such piece of information is the week of the year. When working with date and datetime variables in Python, the ability to easily be able to get different pieces of information about the dates is valuable. '52' ISO week number result is '52' since there is no Thursday in this year's part of the week '01' Sunday is considered first day of week '00' Monday is considered first day of week, Sunday is the last day of the week which started in the previous year import datetimeĭt = datetime.date(2022, 1, 2) #Date is January 2nd (Sunday), 2022, year starts with Saturday The Python datetime strftime() function also can be helpful to get the week number from the date in Python, depending on which calendar you want to use. To get the week number from a date or datetime object in Python, the easiest way is to use the Python isocalendar() function.
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