I also want to know why. The [Localized times and date arithmetic](http://pytz.sourceforge.net/#localized-times-and-date-arithmetic) only says the method to solve this but without reasons.
I also want to know why. The [Localized times and date arithmetic](http:// pytz.sourceforg e.net/# localized- times-and- date-arithmetic) only says the method to solve this but without reasons.