问题描述
我有一个日期,我建立:
从datetime import datetime
从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)
追溯(最近的最后一次呼叫):
文件< stdin>,第1行在< module>
NameError:未定义名称'EST'
>> test2.replace(tzinfo = UTC)
追溯(最近的最后一次调用):
文件< stdin>,第1行,< module>
NameError:name'UTC'未定义
我找不到文档可以在 replace.tzinfo =
调用中分配给tzinfo的时区列表名称
$ / b
$ b
我已阅读以下内容,没有任何内容:
$ b $我也在谷歌搜索。
编辑:我遵循unutbu提供的解决方案,但我得到以下内容:
>>> test ='2013-03-27 00:05'
>>> test
'2013-03-27 00:05'
>>> test2 = dt.datetime.strp(test,'%Y-%m-%d%H:%M')
>>> test2
datetime.datetime(2013,3,27,0,5)
>>> est = pytz.timezone('US / Eastern')
>>> utc = pytz.utc
>>> print(est.localize(test2))
2013-03-27 00:05:00-04:00
>>> print(utc.localize(test2))
2013-03-27 00:05:00 + 00:00
>>> print(est.localize(test2,is_dst = False))
2013-03-27 00:05:00-04:00
>>> print(est.localize(test2,is_dst = True))
2013-03-27 00:05:00-04:00
>>>
正如你所看到的,即使我提供了is_dst =标志,偏移仍然是'-04:00 这是EDT而不是EST。我很感激帮助谢谢。
文档显示以下内容:
如果您坚持使用本地时间,此库提供了一个明确构建它们的设施:
>>> loc_dt = datetime(2002,10,27,1,30,00)
>>> est_dt = east.localize(loc_dt,is_dst = True)
>>> edt_dt = east.localize(loc_dt,is_dst = False)
>>> print(est_dt.strftime(fmt)+'/'+ edt_dt.strftime(fmt))
2002-10-27 01:30:00 EDT-0400 / 2002-10-27 01:30:00 EST-东部早在文档中定义为 east = timezone('US'),在$ 00
这似乎表明 is_dst = flag
应该进一步指定是否指定日间节约光。我很乐意帮助我为什么这不工作在我的情况。
标准库没有定义任何时区 - 至少不太好(不会处理像)。对于预定义的时区,请使用第三方。
import pytz
import datetime as DT
east = pytz.timezone('US / Eastern')
utc = pytz.utc
test ='2013-03-27 23:05'
这是一个天真的datetime: / p>
test2 = DT.datetime.strptime(test,'%Y-%m-%d%H:%M')
print(test2)
#2013-03-27 23:05:00
通过将 test2
解释为EST时区中的时区知道datetime:
print(east.localize(test2))
#2013-03-27 23:05:00-04:00
通过将 test2
解释为UTC时区中的时区来实现日期时间:
print(utc.localize(test2))
#2013-03-27 23:05:00 + 00:00
或者,您可以转换一个t imezone感知datetime到另一个时区使用 astimezone
方法:
test2_eastern = east.localize(test2)
print(test2_eastern.astimezone(utc))
#2013-03-28 03:05:00 + 00:00
I have a date that I build:
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 names
that I can assign to tzinfo in the replace.tzinfo=
call.
I have read through the following and there is nothing:
http://docs.python.org/2/library/datetime.html#tzinfo-objects
I have also searched in google.
Edit: I followed the solution provided by unutbu but I get the following:
>>> 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.
The documentation shows the following:
If you insist on working with local times, this library provides a facility for constructing them unambiguously: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')
This seems to indicate that the is_dst= flag
should further specify whether day light savings is specified or not. I would appreciate help on why this isn't working in my case.
The standard library does not define any timezones -- at least not well (the toy example given in the documentation does not handle subtle problems like the ones mentioned here). For predefined timezones, use the third-party pytz module.
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:
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 test2
as if it were in the EST timezone:
print(eastern.localize(test2))
# 2013-03-27 23:05:00-04:00
This makes a timezone-aware datetime by interpreting test2
as if it were in the UTC timezone:
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 astimezone
method:
test2_eastern = eastern.localize(test2)
print(test2_eastern.astimezone(utc))
# 2013-03-28 03:05:00+00:00
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