How to Convert UTC Datetime to Local Datetime in Python Using the Standard Library?

Converting UTC Datetime to Local Datetime Using Standard Library

Converting a UTC datetime instance to a local datetime can be done using the standard library in Python. A common solution is to use the astimezone method, but it requires providing a timezone object. Here are alternative approaches using only the standard library:

Python 3.3 :

<code class="python">from datetime import datetime, timezone

def utc_to_local(utc_dt):
    return utc_dt.replace(tzinfo=timezone.utc).astimezone(tz=None)</code>

Python 2/3:

<code class="python">import calendar
from datetime import datetime, timedelta

def utc_to_local(utc_dt):
    timestamp = calendar.timegm(utc_dt.timetuple())
    local_dt = datetime.fromtimestamp(timestamp)
    assert utc_dt.resolution >= timedelta(microseconds=1)
    return local_dt.replace(microsecond=utc_dt.microsecond)</code>

Using pytz (Python 2/3):

<code class="python">import pytz

local_tz = pytz.timezone('Europe/Moscow') # Provide your local timezone name

def utc_to_local(utc_dt):
    local_dt = utc_dt.replace(tzinfo=pytz.utc).astimezone(local_tz)
    return local_tz.normalize(local_dt)</code>

Example:

<code class="python">def aslocaltimestr(utc_dt):
    return utc_to_local(utc_dt).strftime('%Y-%m-%d %H:%M:%S.%f %Z%z')

utc_dt = datetime(2010, 6, 6, 17, 29, 7, 730000)
print(aslocaltimestr(utc_dt))</code>

This will print the local datetime string based on the default timezone.

Note: The default timezone is not always reliable and may vary based on system settings. For more reliable and cross-platform results, it is recommended to specify the local timezone explicitly.

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