How do I print a datetime in the local timezone

Question

Let s say I have a variable t that s set to this   datetime datetime 2009  7  10  18  44  59  193982  tzinfo  lt UTC gt     If I say str t   i get    2009-07-10 18 44 59 193982 00 00    How can I get a similar string  except printed in the local timezone rather than UTC

User · Answer

I wrote something like this the other day:

import time, datetime
def nowString():
    # we want something like '2007-10-18 14:00+0100'
    mytz="%+4.4d" % (time.timezone / -(60*60) * 100) # time.timezone counts westwards!
    dt  = datetime.datetime.now()
    dts = dt.strftime('%Y-%m-%d %H:%M')  # %Z (timezone) would be empty
    nowstring="%s%s" % (dts,mytz)
    return nowstring

So the interesting part for you is probably the line starting with "mytz=...". time.timezone returns the local timezone, albeit with opposite sign compared to UTC. So it says "-3600" to express UTC+1.

Despite its ignorance towards Daylight Saving Time (DST, see comment), I'm leaving this in for people fiddling around with time.timezone.

User · Answer

As of python 3 2  using only standard library functions   u tm   datetime datetime utcfromtimestamp 0  l tm   datetime datetime fromtimestamp 0  l tz   datetime timezone l tm - u tm   t   datetime datetime 2009  7  10  18  44  59  193982  tzinfo l tz  str t   2009-07-10 18 44 59 193982-07 00    Just need to use l tm - u tm or u tm - l tm depending whether you want to show as   or - hours from UTC   I am in MST  which is where the -07 comes from   Smarter code should be able to figure out which way to subtract   And only need to calculate the local timezone once   That is not going to change   At least until you switch from to Daylight time

User · Answer

This script demonstrates a few ways to show the local timezone using astimezone        usr bin env python3  import pytz from datetime import datetime  timezone from tzlocal import get localzone  utc dt   datetime now timezone utc   PST   pytz timezone  US Pacific   EST   pytz timezone  US Eastern   JST   pytz timezone  Asia Tokyo   NZST   pytz timezone  Pacific Auckland    print  Pacific time     format utc dt astimezone PST  isoformat     print  Eastern time     format utc dt astimezone EST  isoformat     print  UTC time         format utc dt isoformat     print  Japan time       format utc dt astimezone JST  isoformat        Use astimezone   without an argument print  Local time       format utc dt astimezone   isoformat        Use tzlocal get localzone print  Local time       format utc dt astimezone get localzone    isoformat        Explicitly create a pytz timezone object   Substitute a pytz timezone object for your timezone print  Local time       format utc dt astimezone NZST  isoformat       It outputs the following       timezones py  Pacific time 2019-02-22T17 54 14 957299-08 00 Eastern time 2019-02-22T20 54 14 957299-05 00 UTC time     2019-02-23T01 54 14 957299 00 00 Japan time   2019-02-23T10 54 14 957299 09 00 Local time   2019-02-23T14 54 14 957299 13 00 Local time   2019-02-23T14 54 14 957299 13 00 Local time   2019-02-23T14 54 14 957299 13 00   As of python 3 6 calling astimezone   without a timezone object defaults to the local zone  docs   This means you don t need to import tzlocal and can simply do the following      usr bin env python3  from datetime import datetime  timezone  utc dt   datetime now timezone utc   print  Local time     format utc dt astimezone   isoformat

User · Answer

Think your should look around  datetime astimezone    http   docs python org library datetime html datetime datetime astimezone  Also see pytz module - it s quite easy to use -- as example   eastern   timezone  US Eastern     http   pytz sourceforge net   Example   from datetime import datetime import pytz from tzlocal import get localzone     pip install tzlocal  utc dt   datetime 2009  7  10  18  44  59  193982  tzinfo pytz utc  print utc dt astimezone get localzone       print local time   - gt  2009-07-10 14 44 59 193982-04 00

User · Answer

I believe the best way to do this is to use the LocalTimezone class defined in the datetime tzinfo documentation  goto http   docs python org library datetime html tzinfo-objects and scroll down to the  Example tzinfo classes  section    Assuming Local is an instance of LocalTimezone  t   datetime datetime 2009  7  10  18  44  59  193982  tzinfo utc  local t   t astimezone Local    then str local t  gives    2009-07-11 04 44 59 193982 10 00    which is what you want    Note  this may look weird to you because I m in New South Wales  Australia which is 10 or 11 hours ahead of UTC

User · Answer

I use this function datetime to local timezone    which seems overly convoluted but I found no simpler version of a function that converts a datetime instance to the local time zone  as configured in the operating system  with the UTC offset that was in effect at that time   import time  datetime  def datetime to local timezone dt       epoch   dt timestamp     Get POSIX timestamp of the specified datetime      st time   time localtime epoch     Get struct time for the timestamp  This will be created using the system s locale and it s time zone information      tz   datetime timezone datetime timedelta seconds   st time tm gmtoff     Create a timezone object with the computed offset in the struct time       return dt astimezone tz    Move the datetime instance to the new time zone   utc   datetime timezone datetime timedelta    dt1   datetime datetime 2009  7  10  18  44  59  193982  utc    DST was in effect dt2   datetime datetime 2009  1  10  18  44  59  193982  utc    DST was not in effect  print dt1  print datetime to local timezone dt1    print dt2  print datetime to local timezone dt2     This example prints four dates  For two moments in time  one in January and one in July 2009  each  it prints the timestamp once in UTC and once in the local time zone  Here  where CET  UTC 01 00  is used in the winter and CEST  UTC 02 00  is used in the summer  it prints the following   2009-07-10 18 44 59 193982 00 00 2009-07-10 20 44 59 193982 02 00  2009-01-10 18 44 59 193982 00 00 2009-01-10 19 44 59 193982 01 00

[python] How do I print a datetime in the local timezone?

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