calculate month out of number of days in year

Question

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Python Question: Year and Day of Year to date?

Is there a method in Python to figure out which month a certain day of the year is in, e.g. today is day 299 (October 26th). I would like to figure out, that day 299 is in month 10 (to compile the string to set the Linux system time). How can I do this?

Also, October 26th is day 300 this year, not day 299. Leap year, you know. — Mark Reed, Oct 27 '12 at 01:18

Mark Ransom · Accepted Answer · 2012-10-29T21:29:04.357

3

print (datetime.datetime(2012,1,1) + datetime.timedelta(days=299)).month

Here's a little more usable version that returns both the month and day:

def get_month_day(year, day, one_based=False):
    if one_based:  # if Jan 1st is 1 instead of 0
        day -= 1
    dt = datetime.datetime(year, 1, 1) + datetime.timedelta(days=day)
    return dt.month, dt.day

>>> get_month_day(2012, 299)
(10, 26)

edited Oct 29 '12 at 21:29

answered Oct 27 '12 at 01:38

Mark Ransom

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Thanks Mark, also, how do I find out which day of the month it actually is? – stdcerr Oct 29 '12 at 21:12
Got it: print (datetime.datetime(2012,1,1) + datetime.timedelta(days=299)).day – stdcerr Oct 29 '12 at 21:27

rantanplan · Answer 2 · 2012-10-27T09:25:21.877

1

I know of no such method, but you can do it like this:

print datetime.datetime.strptime('2012 299', '%Y %j').month

The above prints 10

edited Oct 27 '12 at 09:25

answered Oct 27 '12 at 01:29

rantanplan

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calculate month out of number of days in year

2 Answers2