True, and I should have mentioned that. The database is a bit misleading in that it does provide for data before that point for tzids, even though logically some of them should be broken into several IDs based on differences before 1970. On the other hand, one can well understand putting a cut-off point in place, if only because it is difficult to get reliable data earlier, and it is not as important for implementations. Mark ----- Original Message ----- From: "David Keegel" <djk@cybersource.com.au> To: "Mark Davis" <mark.davis@jtcsv.com> Cc: "Funda Wang" <fundawang@gmail.com>; "Paul Eggert" <eggert@CS.UCLA.EDU>; "Tz (tz@elsie.nci.nih.gov)" <tz@lecserver.nci.nih.gov> Sent: Saturday, February 05, 2005 15:54 Subject: Re: Re[2]: Corrections to timezone database
On Sat, Feb 05, 2005 at 02:55:32PM -0800, Mark Davis wrote:
As far as we are concerned, the tzid is simply an internal tag, marking
a
region of the Earth that has the same timezone behavior, all the way back to the point in time where timezones started to be used instead of solar time.
The Theory file says: * Uniquely identify every national region where clocks have all agreed since 1970.
So change "all the way back to the point in time where timezones started to be used instead of solar time" to "since the year 1970."
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David Keegel <djk@cybersource.com.au> http://www.cyber.com.au/users/djk/ Cybersource P/L: Linux/Unix Systems Administration Consulting/Contracting