Python Timezone conversion

Question

I am looking for a quick way to type in a time and then python convert it into other timezones   maybe up to 10 different timezones    Sorry  I am not familar with time in python at all  if someone could put me in the right direction I would really appreciate it

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Using pytz  from datetime import datetime from pytz import timezone  fmt     Y- m- d  H  M  S  Z z  timezonelist     UTC   US Pacific   Europe Berlin   for zone in timezonelist       now time   datetime now timezone zone       print now time strftime fmt

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I have found that the best approach is to convert the  moment  of interest to a utc-timezone-aware datetime object  in python  the timezone component is not required for datetime objects    Then you can use astimezone to convert to the timezone of interest  reference    from datetime import datetime import pytz  utcmoment naive   datetime utcnow   utcmoment   utcmoment naive replace tzinfo pytz utc     print  utcmoment naive   0   format utcmoment naive    python 2 print  utcmoment naive   0   format utcmoment naive   print  utcmoment         0   format utcmoment    localFormat     Y- m- d  H  M  S   timezones     America Los Angeles    Europe Madrid    America Puerto Rico    for tz in timezones      localDatetime   utcmoment astimezone pytz timezone tz       print localDatetime strftime localFormat      utcmoment naive  2017-05-11 17 43 30 802644   utcmoment        2017-05-11 17 43 30 802644 00 00   2017-05-11 10 43 30   2017-05-11 19 43 30   2017-05-11 13 43 30   So  with the moment of interest in the local timezone  a time that exists   you convert it to utc like this  reference    localmoment naive   datetime strptime  2013-09-06 14 05 10   localFormat   localtimezone   pytz timezone  Australia Adelaide    try      localmoment   localtimezone localize localmoment naive  is dst None      print  Time exists        utcmoment   localmoment astimezone pytz utc   except pytz exceptions NonExistentTimeError as e      print  NonExistentTimeError

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To convert a time in one timezone to another timezone in Python  you could use datetime astimezone     time in new timezone   time in old timezone astimezone new timezone    Given aware dt  a datetime object in some timezone   to convert it to other timezones and to print the times in a given time format      usr bin env python3 import pytz      pip install pytz  time format     Y- m- d  H  M  S z  tzids     Asia Shanghai    Europe London    America New York   for tz in map pytz timezone  tzids       time in tz   aware dt astimezone tz      print f  time in tz  time format       If f   syntax is unavailable  you could replace it with    format   vars     where you could set aware dt from the current time in the local timezone   from datetime import datetime import tzlocal      pip install tzlocal  local timezone   tzlocal get localzone   aware dt   datetime now local timezone    the current time   Or from the input time string in the local timezone   naive dt   datetime strptime time string  time format  aware dt   local timezone localize naive dt  is dst None    where time string could look like   2016-11-19 02 21 42   It corresponds to time format     Y- m- d  H  M  S    is dst None forces an exception if the input time string corresponds to a non-existing or ambiguous local time such as during a DST transition  You could also pass is dst False  is dst True  See links with more details at Python  How do you convert datetime timestamp from one timezone to another timezone

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Python 3 9 adds the zoneinfo module so now only the the standard library is needed    gt  gt  gt  from zoneinfo import ZoneInfo  gt  gt  gt  from datetime import datetime   gt  gt  gt  d   datetime 2020  10  31  12  tzinfo ZoneInfo  America Los Angeles     gt  gt  gt  d astimezone ZoneInfo  Europe Berlin       12 00 in Cali will be 20 00 in Berlin datetime datetime 2020  10  31  20  0  tzinfo zoneinfo ZoneInfo key  Europe Berlin      Wikipedia list of available time zones    Some functions such as now   and utcnow   return timezone-unaware datetimes  meaning they contain no timezone information  I recommend only requesting timezone-aware values from them using the keyword tz ZoneInfo  localtime     If astimezone gets a timezone-unaware input  it will assume it is local time  which can lead to errors    gt  gt  gt  datetime utcnow      UTC -- NOT timezone-aware   datetime datetime 2020  6  1  22  39  57  376479   gt  gt  gt  datetime now         Local time -- NOT timezone-aware   datetime datetime 2020  6  2  0  39  57  376675    gt  gt  gt  datetime now tz ZoneInfo  localtime       timezone-aware datetime datetime 2020  6  2  0  39  57  376806  tzinfo zoneinfo ZoneInfo key  localtime     gt  gt  gt  datetime now tz ZoneInfo  Europe Berlin       timezone-aware datetime datetime 2020  6  2  0  39  57  376937  tzinfo zoneinfo ZoneInfo key  Europe Berlin     gt  gt  gt  datetime utcnow   astimezone ZoneInfo  Europe Berlin       WRONG   datetime datetime 2020  6  1  22  39  57  377562  tzinfo zoneinfo ZoneInfo key  Europe Berlin        Windows has no system time zone database  so here an extra package is needed   pip install tzdata       There is a backport to allow use in Python 3 6 to 3 8   sudo pip install backports zoneinfo   Then   from backports zoneinfo import ZoneInfo

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For Python 3 2  simple-date is a wrapper around pytz that tries to simplify things   If you have a time then  SimpleDate time  convert tz          may do what you want   But timezones are quite complex things  so it can get significantly more complicated - see the the docs

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Please note  The first part of this answer is or version 1 x of pendulum  See below for a version 2 x answer   I hope I m not too late   The pendulum library excels at this and other date-time calculations    gt  gt  gt  import pendulum  gt  gt  gt  some time zones     Europe Paris    Europe Moscow    America Toronto    UTC    Canada Pacific    Asia Macao    gt  gt  gt  heres a time    1996-03-25 12 03 -0400   gt  gt  gt  pendulum time   pendulum datetime strptime heres a time    Y- m- d  H  M  z    gt  gt  gt  for tz in some time zones          tz  pendulum time astimezone tz             Europe Paris    lt Pendulum  1996-03-25T17 03 00 01 00  gt     Europe Moscow    lt Pendulum  1996-03-25T19 03 00 03 00  gt     America Toronto    lt Pendulum  1996-03-25T11 03 00-05 00  gt     UTC    lt Pendulum  1996-03-25T16 03 00 00 00  gt     Canada Pacific    lt Pendulum  1996-03-25T08 03 00-08 00  gt     Asia Macao    lt Pendulum  1996-03-26T00 03 00 08 00  gt     Answer lists the names of the time zones that may be used with pendulum   They re the same as for pytz    For version 2    some time zones is a list of the names of the time zones that might be used in a program heres a time is a sample time  complete with a time zone in the form  -0400  I begin by converting the time to a pendulum time for subsequent processing now I can show what this time is in each of the time zones in show time zones         gt  gt  gt  import pendulum  gt  gt  gt  some time zones     Europe Paris    Europe Moscow    America Toronto    UTC    Canada Pacific    Asia Macao    gt  gt  gt  heres a time    1996-03-25 12 03 -0400   gt  gt  gt  pendulum time   pendulum from format  1996-03-25 12 03 -0400    YYYY-MM-DD hh mm ZZ    gt  gt  gt  for tz in some time zones          tz  pendulum time in tz tz             Europe Paris   DateTime 1996  3  25  17  3  0  tzinfo Timezone  Europe Paris       Europe Moscow   DateTime 1996  3  25  19  3  0  tzinfo Timezone  Europe Moscow       America Toronto   DateTime 1996  3  25  11  3  0  tzinfo Timezone  America Toronto       UTC   DateTime 1996  3  25  16  3  0  tzinfo Timezone  UTC       Canada Pacific   DateTime 1996  3  25  8  3  0  tzinfo Timezone  Canada Pacific       Asia Macao   DateTime 1996  3  26  0  3  0  tzinfo Timezone  Asia Macao

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Program import time import os  os environ  TZ      US Eastern  time tzset   print  US Eastern in string form   time asctime      os environ  TZ      Australia Melbourne  time tzset   print  Australia Melbourne in string form   time asctime     os environ  TZ      Asia Kolkata  time tzset   print  Asia Kolkata in string form   time asctime

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For Python timezone conversions  I use the handy table from the PyCon 2012 presentation by Taavi Burns

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Time conversion To convert a time in one timezone to another timezone in Python  you could use datetime astimezone    so  below code is to convert the local time to other time zone   datetime datetime today   - return current the local time datetime astimezone       - convert the time zone  but we have to pass the time zone  pytz timezone  Asia Kolkata   -passing the time zone to pytz module Strftime - Convert Datetime to string    Time conversion from local time import datetime import pytz dt today   datetime datetime today       Local time dt India   dt today astimezone pytz timezone  Asia Kolkata     dt London   dt today astimezone pytz timezone  Europe London    India    dt India strftime   m  d  Y  H  M    London    dt London strftime   m  d  Y  H  M    print  quot Indian standard time   quot  India  quot  IST quot   print  quot British Summer Time   quot  London  quot  BST quot    list all the time zone import pytz for tz in pytz all timezones      print tz

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import datetime import pytz  def convert datetime timezone dt  tz1  tz2       tz1   pytz timezone tz1      tz2   pytz timezone tz2       dt   datetime datetime strptime dt   Y- m- d  H  M  S       dt   tz1 localize dt      dt   dt astimezone tz2      dt   dt strftime   Y- m- d  H  M  S        return dt   -   dt  date time string tz1  initial time zone tz2  target time zone   -   gt  convert datetime timezone  2017-05-13 14 56 32    Europe Berlin    PST8PDT    2017-05-13 05 56 32    gt  convert datetime timezone  2017-05-13 14 56 32    Europe Berlin    UTC    2017-05-13 12 56 32    -   gt  pytz all timezones 0 10    Africa Abidjan     Africa Accra     Africa Addis Ababa     Africa Algiers     Africa Asmara     Africa Asmera     Africa Bamako     Africa Bangui     Africa Banjul     Africa Bissau

[python] Python Timezone conversion

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