我想存储一个具有本地化 UTC 时区的日期时间对象.可以给存储 datetime 对象的方法一个非本地化的 datetime (naive) 对象或已经本地化的对象.如何确定是否需要本地化?
I want to store a datetime object with a localized UTC timezone. The method that stores the datetime object can be given a non-localized datetime (naive) object or an object that already has been localized. How do I determine if localization is needed?
缺少 if 条件的代码:
Code with missing if condition:
class MyClass:
def set_date(self, d):
# what do i check here?
# if(d.tzinfo):
self.date = d.astimezone(pytz.utc)
# else:
self.date = pytz.utc.localize(d)
如何确定是否需要本地化?
How do I determine if localization is needed?
来自 <代码>日期时间文档:
一个日期时间对象 d
知道 iff:
d.tzinfo is not None and d.tzinfo.utcoffset(d) is not None
d
是幼稚的 iff:
d.tzinfo is None or d.tzinfo.utcoffset(d) is None
虽然如果 d
是表示 UTC 时区时间的日期时间对象,那么您可以在这两种情况下使用:
Though if d
is a datetime object representing time in UTC timezone then you could use in both cases:
self.date = d.replace(tzinfo=pytz.utc)
无论 d
是时区感知还是幼稚,它都能正常工作.
It works regardless d
is timezone-aware or naive.
注意:不要使用带有非固定时区的 datetime.replace()
方法UTC 偏移量(可以将其与 UTC 时区一起使用,否则应使用 tz.localize()
方法).
Note: don't use datetime.replace()
method with a timezone with a non-fixed utc offset (it is ok to use it with UTC timezone but otherwise you should use tz.localize()
method).
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