python：日期时间 tzinfo 时区名称文档
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python: datetime tzinfo time zone names documentation
提问by codingknob
I have a date that I build:
我有一个我建立的日期：
from datetime import datetime
from datetime import tzinfo
test = '2013-03-27 23:05'
test2 = datetime.strptime(test,'%Y-%m-%d %H:%M')
>>> test2
datetime.datetime(2013, 3, 27, 23, 5)
>>> test2.replace(tzinfo=EST)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'EST' is not defined
>> test2.replace(tzinfo=UTC)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'UTC' is not defined
I can't find documentation on the list of time zone namesthat I can assign to tzinfo in the replace.tzinfo=call.
我names在replace.tzinfo=通话中找不到可以分配给 tzinfo的时区列表中的文档。
I have read through the following and there is nothing:
我已阅读以下内容，但没有任何内容：
http://docs.python.org/2/library/datetime.html#tzinfo-objects
http://docs.python.org/2/library/datetime.html#tzinfo-objects
I have also searched in google.
我也在谷歌搜索过。
Edit: I followed the solution provided by unutbu but I get the following:
编辑：我遵循了 unutbu 提供的解决方案，但我得到以下信息：
>>> test = '2013-03-27 00:05'
>>> test
'2013-03-27 00:05'
>>> test2 = dt.datetime.strp(test, '%Y-%m-%d %H:%M')
>>> test2
datetime.datetime(2013, 3, 27, 0, 5)
>>> est = pytz.timezone('US/Eastern')
>>> utc = pytz.utc
>>> print(est.localize(test2))
2013-03-27 00:05:00-04:00
>>> print(utc.localize(test2))
2013-03-27 00:05:00+00:00
>>> print(est.localize(test2,is_dst=False))
2013-03-27 00:05:00-04:00
>>> print(est.localize(test2,is_dst=True))
2013-03-27 00:05:00-04:00
>>>
As you can see even when I provide the is_dst= flag the offset is still '-04:00', which is EDT and not EST. I appreciate the help. Thank you.
正如您所看到的，即使我提供 is_dst= 标志，偏移量仍然是“-04:00”，这是 EDT 而不是 EST。我很感激你的帮助。谢谢你。
The documentation shows the following:
文档显示以下内容：
If you insist on working with local times, this library provides a facility for constructing them unambiguously: http://pytz.sourceforge.net/#problems-with-localtime
如果你坚持使用当地时间，这个库提供了一个明确构建它们的工具：http: //pytz.sourceforge.net/#problems-with-localtime
>>> loc_dt = datetime(2002, 10, 27, 1, 30, 00)
>>> est_dt = eastern.localize(loc_dt, is_dst=True)
>>> edt_dt = eastern.localize(loc_dt, is_dst=False)
>>> print(est_dt.strftime(fmt) + ' / ' + edt_dt.strftime(fmt))
2002-10-27 01:30:00 EDT-0400 / 2002-10-27 01:30:00 EST-0500
eastern was defined earlier in the documentation as eastern = timezone('US/Eastern')
东部在文档中早些时候被定义为 eastern = timezone('US/Eastern')
This seems to indicate that the is_dst= flagshould further specify whether day light savings is specified or not. I would appreciate help on why this isn't working in my case.
这似乎表明is_dst= flag应该进一步指定是否指定夏令时。我很感激有关为什么这在我的情况下不起作用的帮助。
采纳答案by unutbu
The standard library does not define any timezones -- at least not well (the toy example given in the documentationdoes not handle subtle problems like the ones mentioned here). For predefined timezones, use the third-party pytz module.
标准库没有定义任何时区——至少不是很好（文档中给出的玩具示例没有处理像这里提到的那样的微妙问题）。对于预定义的时区，请使用第三方pytz 模块。
import pytz
import datetime as DT
eastern = pytz.timezone('US/Eastern')
utc = pytz.utc
test = '2013-03-27 23:05'
This is a "naive" datetime:
这是一个“天真的”日期时间：
test2 = DT.datetime.strptime(test, '%Y-%m-%d %H:%M')
print(test2)
# 2013-03-27 23:05:00
This makes a timezone-aware datetime by interpreting test2as if it were in the EST timezone:
这通过将test2其解释为 EST 时区来生成时区感知日期时间：
print(eastern.localize(test2))
# 2013-03-27 23:05:00-04:00
This makes a timezone-aware datetime by interpreting test2as if it were in the UTC timezone:
这通过将日期时间解释test2为 UTC 时区来生成时区感知日期时间：
print(utc.localize(test2))
# 2013-03-27 23:05:00+00:00
Alternatively, you can convert one timezone-aware datetime to another timezone using the astimezonemethod:
或者，您可以使用以下astimezone方法将一个时区感知日期时间转换为另一个时区：
test2_eastern = eastern.localize(test2)
print(test2_eastern.astimezone(utc))
# 2013-03-28 03:05:00+00:00
回答by Three-pth
import pytz
timezones=pytz.all_timezones
This gives all timezones
这给出了所有时区
