解析时区缩略语UTC [英] Parse timezone abbreviation to UTC
问题描述
如何将窗体 2010年2月25日,16:19:20 CET
的日期时间字符串转换为unix纪元?
How can I convert a date time string of the form Feb 25 2010, 16:19:20 CET
to the unix epoch?
目前我最好的方法是使用 time.strptime()
是这样的:
Currently my best approach is to use time.strptime()
is this:
def to_unixepoch(s):
# ignore the time zone in strptime
a = s.split()
b = time.strptime(" ".join(a[:-1]) + " UTC", "%b %d %Y, %H:%M:%S %Z")
# this puts the time_tuple(UTC+TZ) to unixepoch(UTC+TZ+LOCALTIME)
c = int(time.mktime(b))
# UTC+TZ
c -= time.timezone
# UTC
c -= {"CET": 3600, "CEST": 2 * 3600}[a[-1]]
return c
从其他问题我看到可能使用 calendar.timegm()
和 pytz
等等,以简化这个,但这些不处理缩写的时区。
I see from other questions that it might be possible to use calendar.timegm()
, and pytz
among others to simplify this, but these don't handle the abbreviated time zones.
我想要一个需要最少的图书馆的解决方案,我喜欢保持标准库与p ossible。
I'd like a solution that requires minimal excess libraries, I like to keep to the standard library as much as possible.
推荐答案
Python标准库并没有真正实现时区。您应该使用 python-dateutil
。它为标准的 datetime
模块提供了有用的扩展,包括时区实现和解析器。
The Python standard library does not really implement time zones. You should use python-dateutil
. It provides useful extensions to the standard datetime
module including a time zones implementation and a parser.
您可以转换时间区域意识 datetime
对象到UTC与 .astimezone(dateutil.tz.tzutc())
。对于当前时间作为时区感知的datetime对象,可以使用 datetime.datetime.utcnow()。replace(tzinfo = dateutil.tz.tzutc())
。 p>
You can convert time zone aware datetime
objects to UTC with .astimezone(dateutil.tz.tzutc())
. For the current time as a timezone aware datetime object, you can use datetime.datetime.utcnow().replace(tzinfo=dateutil.tz.tzutc())
.
import dateutil.tz
cet = dateutil.tz.gettz('CET')
cesttime = datetime.datetime(2010, 4, 1, 12, 57, tzinfo=cet)
cesttime.isoformat()
'2010-04-01T12:57:00+02:00'
cettime = datetime.datetime(2010, 1, 1, 12, 57, tzinfo=cet)
cettime.isoformat()
'2010-01-01T12:57:00+01:00'
# does not automatically parse the time zone portion
dateutil.parser.parse('Feb 25 2010, 16:19:20 CET')\
.replace(tzinfo=dateutil.tz.gettz('CET'))
不幸的是在重复夏令时间内,这种技术将会出错。
Unfortunately this technique will be wrong during the repeated daylight savings time hour.
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