How can I convert a timestamp string with timezone offset to local time?

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佛祖请我去吃肉 2021-02-14 18:00

I am trying to convert a string timestamp into a proper datetime object. The problem I am having is that there is a timezone offset and everything I am doing doesn\'t seem to wo

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  • 2021-02-14 18:30

    The dateutil package is handy for parsing date/times:

    In [10]: date = u"Fri, 16 Jul 2010 07:08:23 -0700"
    
    In [11]: from dateutil.parser import parse
    
    In [12]: parse(date)
    Out[12]: datetime.datetime(2010, 7, 16, 7, 8, 23, tzinfo=tzoffset(None, -25200))
    

    Finally, to convert into your local timezone,

    In [13]: parse(date).astimezone(YOUR_LOCAL_TIMEZONE)
    
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  • 2021-02-14 18:54

    It looks like datetime.datetime.strptime(d, '%a, %d %b %Y %H:%M:%S %z') should work, but according to this bug report there are issues with the %z processing. So you'll probably have to handle the timezone on your own:

    import datetime
    
    d = u"Fri, 16 Jul 2010 07:08:23 -0700"
    
    d, tz_info = d[:-5], d[-5:]
    neg, hours, minutes = tz_info[0], int(tz_info[1:3]), int(tz_info[3:])
    if neg == '-':
        hours, minutes = hours * -1, minutes * -1
    
    d = datetime.datetime.strptime(d, '%a, %d %b %Y %H:%M:%S ')
    print d
    print d + datetime.timedelta(hours = hours, minutes = minutes)
    
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  • 2021-02-14 18:54

    Here's a stdlib solution:

    >>> from datetime import datetime
    >>> from email.utils import mktime_tz, parsedate_tz
    >>> datetime.fromtimestamp(mktime_tz(parsedate_tz(u"Fri, 16 Jul 2010 07:08:23 -0700")))
    datetime.datetime(2010, 7, 16, 16, 8, 23) # your local time may be different
    

    See also, Python: parsing date with timezone from an email.

    Note: fromtimestamp() may fail if the local timezone had different UTC offset in the past (2010) and if it does not use a historical timezone database on the given platform. To fix it, you could use tzlocal.get_localzone(), to get a pytz tzinfo object representing your local timezone. pytz provides access to the tz database in a portable manner:

    >>> timestamp = mktime_tz(parsedate_tz(u"Fri, 16 Jul 2010 07:08:23 -0700"))
    >>> import tzlocal # $ pip install tzlocal
    >>> str(datetime.fromtimestamp(timestamp, tzlocal.get_localzone()))
    '2010-07-16 16:08:23+02:00'
    
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