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
我在我的一个项目中有这样的代码:
from datetime import datetime
## datetime.timezone works in newer versions of python
try:
from datetime import timezone
utc_tz = timezone.utc
except:
import pytz
utc_tz = pytz.utc
def _to_utc_date_string(ts):
# type (Union[date,datetime]]) -> str
"""coerce datetimes to UTC (assume localtime if nothing is given)"""
if (isinstance(ts, datetime)):
try:
## in python 3.6 and higher, ts.astimezone() will assume a
## naive timestamp is localtime (and so do we)
ts = ts.astimezone(utc_tz)
except:
## in python 2.7 and 3.5, ts.astimezone() will fail on
## naive timestamps, but we'd like to assume they are
## localtime
import tzlocal
ts = tzlocal.get_localzone().localize(ts).astimezone(utc_tz)
return ts.strftime("%Y%m%dT%H%M%SZ")
其他回答
如果你喜欢datetime.datetime:
dt = datetime.strptime("2008-09-17 14:04:00","%Y-%m-%d %H:%M:%S")
utc_struct_time = time.gmtime(time.mktime(dt.timetuple()))
utc_dt = datetime.fromtimestamp(time.mktime(utc_struct_time))
print dt.strftime("%Y-%m-%d %H:%M:%S")
怎么样——
time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(seconds))
如果seconds为None，则将本地时间转换为UTC时间，否则将传入的时间转换为UTC时间。
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
你可以用:
>>> from time import strftime, gmtime, localtime
>>> strftime('%H:%M:%S', gmtime()) #UTC time
>>> strftime('%H:%M:%S', localtime()) # localtime
怎么样——
time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(seconds))
如果seconds为None，则将本地时间转换为UTC时间，否则将传入的时间转换为UTC时间。
