On Tue, 5 Mar 2002, Guido van Rossum wrote: (---) >I think I want to introduce a new concept, closely related to local >time, that I'll dub "naive time" for now. In naive time, there is no >timezone and there is no DST. To compensate for DST, you have to >manually change the clock, which is an action outside the system, >unknown to the system, and irrelevant to the working of the system. >Ditto to change time zones. > >Naive time is what you see on your watch or your Palm organizer >(apparently not on PocketPC or Windows/CE though, which are timezone >aware). A day is always 24 hours, and the clock always shows local >time. When the DST jump happens, you lose or win an hour but you do >your best to pretend it didn't happen, by going to bed a little >earlier or by partying a little longer (or any other activity that >causes memory loss :-). (---) >My Palm has no problem keeping track of appointments in different >timezones: when I have a meeting in San Francisco at 11am, I enter it >at 11am, and when I fly there, I move the Palm's clock three hours >back. Naive time adapts to local time -- time flies (or stands still) >when you're in an airplane crossing timezones. > >Naive time calculations are easier than local time calculations, >because they don't have to worry about DST. You only have to be >careful when converting between naive time and UTC (or anything else >that has a concept of timezone). (---) >I'm very tempted to put all the smarts in conversions though: you can >take a naive datetime object, interpret it in a particular timezone >using a given DST ruleset (local time and UTC being two common cases) >and convert it to a timestamp, which has different semantics, but can >be converted back to naive time by interpreting according to some >timezone. (---) Am I misunderstanding something, or is your "naive time" simply local time without the knowledge of DST or time zone ? If so, you have an excellent solution that works 99.97% of the time. Unfortunately, once you have removed the one bit of DST information, it's not always possible to get it back, without knowing _which_ 2:30 Sunday morning... /Paul
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