如何将本地时间的datetime字符串转换为UTC时间的字符串?
我确信我以前做过这个，但找不到它，所以希望将来能帮助我(和其他人)做到这一点。
澄清:例如，如果我的本地时区(+10)是2008-09-17 14:02:00，我希望生成一个具有等效UTC时间的字符串:2008-09-17 04:02:00。
此外，从http://lucumr.pocoo.org/2011/7/15/eppur-si-muove/请注意，一般来说，这是不可能的，因为DST和其他问题没有从本地时间到UTC时间的唯一转换。
当前回答
def local_to_utc(t):
secs = time.mktime(t)
return time.gmtime(secs)
def utc_to_local(t):
secs = calendar.timegm(t)
return time.localtime(secs)
来源:http://feihonghsu.blogspot.com/2008/02/converting-from-local-time-to-utc.html
来自bd808的示例用法:如果您的源是一个datetime。Datetime对象t，调用as:
local_to_utc(t.timetuple())
其他回答
用来避开节衣缩食等。
上面的答案对我没有特别的帮助。下面的代码适用于GMT。
def get_utc_from_local(date_time, local_tz=None):
assert date_time.__class__.__name__ == 'datetime'
if local_tz is None:
local_tz = pytz.timezone(settings.TIME_ZONE) # Django eg, "Europe/London"
local_time = local_tz.normalize(local_tz.localize(date_time))
return local_time.astimezone(pytz.utc)
import pytz
from datetime import datetime
summer_11_am = datetime(2011, 7, 1, 11)
get_utc_from_local(summer_11_am)
>>>datetime.datetime(2011, 7, 1, 10, 0, tzinfo=<UTC>)
winter_11_am = datetime(2011, 11, 11, 11)
get_utc_from_local(winter_11_am)
>>>datetime.datetime(2011, 11, 11, 11, 0, tzinfo=<UTC>)
下面是一些常见的Python时间转换的总结。
有些方法以秒为单位，用(s)标记。可以使用显式公式，如ts = (d - epoch) / unit代替(感谢jfs)。
struct_time (UTC) → POSIX (s):calendar.timegm(struct_time) Naïve datetime (local) → POSIX (s):calendar.timegm(stz.localize(dt, is_dst=None).utctimetuple())(exception during DST transitions, see comment from jfs) Naïve datetime (UTC) → POSIX (s):calendar.timegm(dt.utctimetuple()) Aware datetime → POSIX (s):calendar.timegm(dt.utctimetuple()) POSIX → struct_time (UTC, s):time.gmtime(t)(see comment from jfs) Naïve datetime (local) → struct_time (UTC, s):stz.localize(dt, is_dst=None).utctimetuple()(exception during DST transitions, see comment from jfs) Naïve datetime (UTC) → struct_time (UTC, s):dt.utctimetuple() Aware datetime → struct_time (UTC, s):dt.utctimetuple() POSIX → Naïve datetime (local):datetime.fromtimestamp(t, None)(may fail in certain conditions, see comment from jfs below) struct_time (UTC) → Naïve datetime (local, s):datetime.datetime(struct_time[:6], tzinfo=UTC).astimezone(tz).replace(tzinfo=None)(can't represent leap seconds, see comment from jfs) Naïve datetime (UTC) → Naïve datetime (local):dt.replace(tzinfo=UTC).astimezone(tz).replace(tzinfo=None) Aware datetime → Naïve datetime (local):dt.astimezone(tz).replace(tzinfo=None) POSIX → Naïve datetime (UTC):datetime.utcfromtimestamp(t) struct_time (UTC) → Naïve datetime (UTC, s):datetime.datetime(*struct_time[:6])(can't represent leap seconds, see comment from jfs) Naïve datetime (local) → Naïve datetime (UTC):stz.localize(dt, is_dst=None).astimezone(UTC).replace(tzinfo=None)(exception during DST transitions, see comment from jfs) Aware datetime → Naïve datetime (UTC):dt.astimezone(UTC).replace(tzinfo=None) POSIX → Aware datetime:datetime.fromtimestamp(t, tz)(may fail for non-pytz timezones) struct_time (UTC) → Aware datetime (s):datetime.datetime(struct_time[:6], tzinfo=UTC).astimezone(tz)(can't represent leap seconds, see comment from jfs) Naïve datetime (local) → Aware datetime:stz.localize(dt, is_dst=None)(exception during DST transitions, see comment from jfs) Naïve datetime (UTC) → Aware datetime:dt.replace(tzinfo=UTC)
来源:taaviburns.ca
简单地说，要将任何datetime日期转换为UTC时间:
from datetime import datetime
def to_utc(date):
return datetime(*date.utctimetuple()[:6])
让我们用一个例子来解释。首先，我们需要从字符串中创建一个datetime:
>>> date = datetime.strptime("11 Feb 2011 17:33:54 -0800", "%d %b %Y %H:%M:%S %z")
然后，我们可以调用函数:
>>> to_utc(date)
datetime.datetime(2011, 2, 12, 1, 33, 54)
函数如何一步步工作:
>>> date.utctimetuple()
time.struct_time(tm_year=2011, tm_mon=2, tm_mday=12, tm_hour=1, tm_min=33, tm_sec=54, tm_wday=5, tm_yday=43, tm_isdst=0)
>>> date.utctimetuple()[:6]
(2011, 2, 12, 1, 33, 54)
>>> datetime(*date.utctimetuple()[:6])
datetime.datetime(2011, 2, 12, 1, 33, 54)
def local_to_utc(t):
secs = time.mktime(t)
return time.gmtime(secs)
def utc_to_local(t):
secs = calendar.timegm(t)
return time.localtime(secs)
来源:http://feihonghsu.blogspot.com/2008/02/converting-from-local-time-to-utc.html
来自bd808的示例用法:如果您的源是一个datetime。Datetime对象t，调用as:
local_to_utc(t.timetuple())
首先，将字符串解析为简单的datetime对象。这是datetime的一个实例。没有附加时区信息的日期时间。请参阅其文档。
使用pytz模块，该模块提供了时区+ UTC的完整列表。找出本地时区是什么，从它构造一个timezone对象，并操作它并将其附加到naive datetime。
最后，使用datetime.astimezone()方法将datetime转换为UTC。
源代码，使用本地时区“America/Los_Angeles”，用于字符串“2001-2-3 10:11:12”:
from datetime import datetime
import pytz
local = pytz.timezone("America/Los_Angeles")
naive = datetime.strptime("2001-2-3 10:11:12", "%Y-%m-%d %H:%M:%S")
local_dt = local.localize(naive, is_dst=None)
utc_dt = local_dt.astimezone(pytz.utc)
从那里，你可以使用strftime()方法来格式化UTC日期时间:
utc_dt.strftime("%Y-%m-%d %H:%M:%S")
