home *** CD-ROM | disk | FTP | other *** search
- Date: Wed, 19 Feb 86 17:58:51 est
- From: seismo!cbosgd.ATT.UUCP!mark (Mark Horton)
-
- > Yes, I was aware and worried about both problems. However, in my
- >search of timezones and DST rules worldwide I was not able to find any
- >current or past rules that would have violated the assumptions. Future
- >rules are unlikely to break the current conventions for fear of confusing
- >everybody (it's bad enough now).
-
- You haven't looked hard enough. Also, the minute you make an assumption,
- some congressman or some MP in Britain or Japan or wherever will violate it.
-
- >>>Discussion of (1) why Daylight Saving Time should not be constrained
- >>>to either 0 or 2 changes per year;
-
- There is a thing called "Double Daylight Time" which does exactly that.
- I think it happened a few years back in some other country (Canada?)
- Surely someone on this list can provide details.
-
- >>>and (2) cautioning against a
- >>>timezone name that may contain numerals, '+', or '-'. Both points
- >>>emphasized the possibility of future bizarre changes.
-
- On the contrary, the notion of giving a time zone a name is an American
- notion. They also have names in Europe and Australia, but my impression
- is that in many parts of the world, such as Japan, time zones are named
- according to the ISO format +HHMM, e.g. Japan is +0900.
-
- I'm afraid the variable TZ is already pretty badly broken - it can't be
- used in Newfoundland or Central Australia or Saudi Arabia. (We do have
- sites on Usenet in Newfoundland - as far as I know, they all run 4BSD.)
-
- elsie!ado has written some code with a much more flexible structure
- (and some additional complexity, which I think is unavoidable.) I
- understand he's going to submit it to this group shortly. I think
- it merits serious consideration. How much goes into the standard and
- how much is left to the implementor isn't clear (e.g. is the format
- of the time zone description file part of the standard?) but the code
- is intended to be public domain, and it ought to make a good start.
-
- Mark
-
- Volume-Number: Volume 5, Number 54
-
-