Python Timezone conversion

Python Timezone conversion

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)

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)

Python Timezone conversion

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

–

> convert_datetime_timezone(2017-05-13 14:56:32, Europe/Berlin, PST8PDT)
2017-05-13 05:56:32

> convert_datetime_timezone(2017-05-13 14:56:32, Europe/Berlin, UTC)
2017-05-13 12:56:32

–

> 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]