python时间函数带时区_Python - 在特定时区设置日期时间（无UTC转换）

Just to be clear, this is python 2.6, I am using pytz.

This is for an application that only deals with US timezones, I need to be able to anchor a date (today), and get a unix timestamp (epoch time) for 8pm and 11pm in PST only.

This is driving me crazy.

> pacific = pytz.timezone("US/Pacific")

> datetime(2011,2,11,20,0,0,0,pacific)

datetime.datetime(2011, 2, 11, 20, 0, tzinfo=)

> datetime(2011,2,11,20,0,0,0,pacific).strftime("%s")

'1297454400'

zsh> date -d '@1297454400'

Fri Feb 11 12:00:00 PST 2011

So, even though I am setting up a timezone, and creating the datetime with that time zone, it is still creating it as UTC and then converting it. This is more of a problem since UTC will be a day ahead when I am trying to do the calculations.

Is there an easy (or at least sensical) way to generate a timestamp for 8pm PST today?

(to be clear, I do understand the value of using UTC in most situations, like database timestamps, or for general storage. This is not one of those situations, I specifically need a timestamp for evening in PST, and UTC should not have to enter into it.)

解决方案

Create a tzinfo object utc for the UTC time zone, then try this:

#XXX: WRONG (for any timezone with a non-fixed utc offset), DON'T DO IT

datetime(2011,2,11,20,0,0,0,pacific).astimezone(utc).strftime("%s")

Edit: As pointed out in the comments, putting the timezone into the datetime constructor isn't always robust. The preferred method using the pytz documentation would be:

#XXX: WRONG (unless your local timezone is UTC), DON'T DO IT

pacific.localize(datetime(2011,2,11,20,0,0,0)).astimezone(utc).strftime("%s")