pytz utc转换 [英] pytz utc conversion

问题描述

将天真时间和 tzinfo 转换为UTC时间的正确方法是什么？
说我有：

What is the right way to convert a naive time and a tzinfo into an UTC time? Say I have:

d = datetime(2009, 8, 31, 22, 30, 30)
tz = timezone('US/Pacific')

首先，pytz启发：

First way, pytz inspired:

d_tz = tz.normalize(tz.localize(d))
utc = pytz.timezone('UTC')
d_utc = d_tz.astimezone(utc)

第二种方法是从 UTCDateTimeField

def utc_from_localtime(dt, tz):
    dt = dt.replace(tzinfo=tz)
    _dt = tz.normalize(dt)
    if dt.tzinfo != _dt.tzinfo:
        # Houston, we have a problem...
        # find out which one has a dst offset
        if _dt.tzinfo.dst(_dt):
            _dt -= _dt.tzinfo.dst(_dt)
        else:
            _dt += dt.tzinfo.dst(dt)
    return _dt.astimezone(pytz.utc)

不用说这两种方法产生不同的结果

Needless to say those two methods produce different results for quite a few timezones.

问题是 - 正确的方法是什么？

Question is - what's the right way?

推荐答案

您的第一种方法似乎是被批准的方法，应该是DST感知的。

Your first method seems to be the approved one, and should be DST-aware.

自从pyz以后，您可以缩短一点。 utc = pytz.timezone（'UTC'），但你知道已经：）

You could shorten it a tiny bit, since pytz.utc = pytz.timezone('UTC'), but you knew that already :)

tz = timezone('US/Pacific')
def toUTC(d):
    return tz.normalize(tz.localize(d)).astimezone(pytz.utc)

print "Test: ", datetime.datetime.utcnow(), " = ", toUTC(datetime.datetime.now())

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