从Python 3.9开始，你可以使用zoneinfo模块。

首先让我们用utcnow()获取时间:

>>> from datetime import datetime
>>> database_time = datetime.utcnow()
>>> database_time
datetime.datetime(2021, 9, 24, 4, 18, 27, 706532)

然后创建时区:

>>> from zoneinfo import ZoneInfo
>>> utc = ZoneInfo('UTC')
>>> localtz = ZoneInfo('localtime')

然后转换。为了在时区之间进行转换，datetime必须知道它所在的时区，然后我们只需使用astimezone():

>>> utctime = database_time.replace(tzinfo=utc)
>>> localtime = utctime.astimezone(localtz)
>>> localtime
datetime.datetime(2021, 9, 24, 6, 18, 27, 706532, tzinfo=zoneinfo.ZoneInfo(key='localtime'))

对于Python 3.6到3.8，你需要后台端口。zoneinfo模块:

>>> try:
>>>     from zoneinfo import ZoneInfo
>>> except ImportError:
>>>     from backports.zoneinfo import ZoneInfo

其余的都是一样的。

对于更早的版本，需要pytz或dateutil。Datutil的工作原理类似于zoneinfo:

>>> from dateutil import tz
>>> utc = tz.gettz('UTC')
>>> localtz = tz.tzlocal()

The Conversion:
>>> utctime = now.replace(tzinfo=UTC)
>>> localtime = utctime.astimezone(localtz)
>>> localtime
datetime.datetime(2010, 12, 30, 15, 51, 22, 114668, tzinfo=tzlocal())

pytz有一个不同的接口，这是Python的时区处理不处理歧义时间的结果:

>>> import pytz
>>> utc = pytz.timezone('UTC')
# There is no local timezone support, you need to know your timezone
>>> localtz = pytz.timezone('Europe/Paris')

>>> utctime = utc.localize(database_time)
>>> localtime = localtz.normalize(utctime.astimezone(localtz))
>>> localtime

根据阿列克谢的评论。这也适用于DST。

import time
import datetime

def utc_to_local(dt):
    if time.localtime().tm_isdst:
        return dt - datetime.timedelta(seconds = time.altzone)
    else:
        return dt - datetime.timedelta(seconds = time.timezone)

使用时间。timezone，它给出一个“UTC以西秒数”的整数。

例如:

from datetime import datetime, timedelta, timezone
import time

# make datetime from timestamp, thus no timezone info is attached
now = datetime.fromtimestamp(time.time())

# make local timezone with time.timezone
local_tz = timezone(timedelta(seconds=-time.timezone))

# attach different timezones as you wish
utc_time = now.astimezone(timezone.utc)
local_time = now.astimezone(local_tz)

print(utc_time.isoformat(timespec='seconds')) 
print(local_time.isoformat(timespec='seconds'))

在我的PC上(Python 3.7.3)，它给出:

2021-05-07T12:50:46+00:00
2021-05-07T20:50:46+08:00

非常简单，只使用标准库~

在Python 2和3中工作的简单(但可能有缺陷)方法:

import time
import datetime

def utc_to_local(dt):
    return dt - datetime.timedelta(seconds = time.timezone)

它的优点是写一个逆函数很简单

在Python 3.3+中:

from datetime import datetime, timezone

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

Python 2/3:

import calendar
from datetime import datetime, timedelta

def utc_to_local(utc_dt):
    # get integer timestamp to avoid precision lost
    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)

使用pytz(都是Python 2/3):

import pytz

local_tz = pytz.timezone('Europe/Moscow') # use your local timezone name here
# NOTE: pytz.reference.LocalTimezone() would produce wrong result here

## You could use `tzlocal` module to get local timezone on Unix and Win32
# from tzlocal import get_localzone # $ pip install tzlocal

# # get local timezone    
# local_tz = get_localzone()

def utc_to_local(utc_dt):
    local_dt = utc_dt.replace(tzinfo=pytz.utc).astimezone(local_tz)
    return local_tz.normalize(local_dt) # .normalize might be unnecessary

例子

def aslocaltimestr(utc_dt):
    return utc_to_local(utc_dt).strftime('%Y-%m-%d %H:%M:%S.%f %Z%z')

print(aslocaltimestr(datetime(2010,  6, 6, 17, 29, 7, 730000)))
print(aslocaltimestr(datetime(2010, 12, 6, 17, 29, 7, 730000)))
print(aslocaltimestr(datetime.utcnow()))

输出

Python 3.3

2010-06-06 21:29:07.730000 MSD+0400
2010-12-06 20:29:07.730000 MSK+0300
2012-11-08 14:19:50.093745 MSK+0400

Python 2

2010-06-06 21:29:07.730000 
2010-12-06 20:29:07.730000 
2012-11-08 14:19:50.093911 

pytz

2010-06-06 21:29:07.730000 MSD+0400
2010-12-06 20:29:07.730000 MSK+0300
2012-11-08 14:19:50.146917 MSK+0400

注意:它考虑了DST和MSK时区utc偏移量的最近变化。

我不知道非pytz解决方案是否适用于Windows。

我发现的最简单的方法是得到你所处位置的时间偏移量，然后从小时中减去它。

def format_time(ts,offset):
    if not ts.hour >= offset:
        ts = ts.replace(day=ts.day-1)
        ts = ts.replace(hour=ts.hour-offset)
    else:
        ts = ts.replace(hour=ts.hour-offset)
    return ts

在Python 3.5.2中，这对我来说是可行的。