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Get the GMT time given date and UTC offset in python

Answer 1

+1 A:

You could use dateutil for that:

>>> from dateutil.parser import parse
>>> dt = parse('19981024103115+0100')
>>> dt
datetime.datetime(1998, 10, 24, 10, 31, 15, tzinfo=tzoffset(None, 3600))
>>> dt.utctimetuple()
time.struct_time(tm_year=1998, tm_mon=10, tm_mday=24, tm_hour=9, tm_min=31, tm_sec=15, tm_wday=5, tm_yday=297, tm_isdst=0)

SilentGhost 2010-10-28 16:45:29

@SilentGhost - +1, thanks for the better answer. `time.strftime("%Y-%m-%d %H:%M:%S", t)` will give the desired output. Turns out that parsing using `time.strptime()` doesn't work so great with %Z for time zones like "+0100".

bstpierre 2010-10-28 16:49:46

@bstpierre, I've never understood why `datetime` doesn't include better support for time zones. It seems like such an essential requirement.

Mark Ransom 2010-10-28 17:18:51

@Mark Ransom - I was talking about `time`, but I agree with your comment. Dealing with timezones properly is not easy.

bstpierre 2010-10-28 17:28:19

@bstpierre, I was talking about `datetime` as a module not a class, so my comment included `time` as well.

Mark Ransom 2010-10-28 17:39:41

Answer 2

A:

As long as you know that the time offset will always be in the 4-digit form, this should work.

def MakeTime(date_string, offset_string):
    offset_hours = int(offset_string[0:3])
    offset_minutes = int(offset_string[0] + offset_string[3:5])
    gmt_adjust = datetime.timedelta(hours = offset_hours, minutes = offset_minutes)
    gmt_time = datetime.datetime.strptime(date_string, '%Y%m%d%H%M%S') - gmt_adjust
    return gmt_time

Mark Ransom 2010-10-28 17:00:15

What if offset is negative?

adw 2010-10-28 17:30:29

@adw, good point, there was an error when the offset was negative and the minutes were non-zero, e.g. '-0130'. Fixed.

Mark Ransom 2010-10-28 18:05:22

@Mark Ransom: Nope, not fixed. For example, compare `offset = -100` with `offset = -101`.

adw 2010-10-28 18:15:05

@adw, thanks again, that was very sloppy of me. I've tried a different approach this time, I think it's finally right.

Mark Ransom 2010-10-28 18:49:56

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Get the GMT time given date and UTC offset in python

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