How to Get a Specific Date from a Week Number?

Susan Sarandon
Release: 2024-11-11 21:16:03
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How to Get a Specific Date from a Week Number?

Obtaining Date from Week Number

Determining a date from solely a week number can be challenging. One potential issue in your code is that a week number alone is insufficient to extract a specific date. Addressing this, we suggest incorporating a default day within the week.

import datetime
d = "2013-W26"
r = datetime.datetime.strptime(d + '-1', "%Y-W%W-%w")
print(r)
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In this modified code, the '-1' specifies the first day (Monday) of the given week. This ensures that a unique date is generated within the specified week. Consequently, the code will produce the following output:

2013-07-01 00:00:00
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It's worth noting that %W assumes Monday as the first day of the week in its calculations. Altering this assumption may lead to unexpected results.

For those considering ISO week dates, remember to utilize the %G-W%V-%u directives instead for Python versions 3.6 and above.

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