Converting python date to week

Question

 datetime.date(2010, 1, 1).isocalendar()[1]

gives week number 53 since 1st Jan 2010 was in a week which started in 2009. However, I would like to start Jan 1, 2010 as week 1. Is there any option in datetime isocalendar to do this?

If I follow the solution at How can I get the current week using Python?, I get 53 as result

possible duplicate of [How can I get the current week using Python?](http://stackoverflow.com/questions/2003841/how-can-i-get-the-current-week-using-python) — KevinDTimm, Apr 30 '15 at 21:42
Not a duplicate, the solution there will give 53 as result and not 1 which is what I want — user308827, Apr 30 '15 at 21:45
That's because it *is the 53rd week*. This is the standard. There simply isn't a way to do this the way you want to. — That1Guy, Apr 30 '15 at 21:56

unutbu · Accepted Answer · 2015-04-30T21:57:18.070

4

Compute the number of days since the first of the year, integer-divide by 7 and add 1:

>>> import datetime as DT
>>> (DT.date(2010,1,1)-DT.date(2010,1,1)).days // 7 + 1
1

This notion of week number is very different from the ISO week definition, so you aren't going to find an option to do this in isocalendar.

edited Apr 30 '15 at 21:57

answered Apr 30 '15 at 21:53

unutbu

842,883
184
1,785
1,677

score 0 · Answer 2 · answered Apr 30 '15 at 21:49

0

If you're going to be getting data in total weeks since a point, you can mod that number by the number of weeks in a year (52) to get the remainder (ie, how many weeks into the year you are):

>>> 53 % 52
>>> 1
>>> 925 % 52
>>> 41

answered Apr 30 '15 at 21:49

a p

3,098
2
24
46

Converting python date to week

2 Answers2