[tz] Dealing with Pre-1970 Data
Paul Eggert
eggert at cs.ucla.edu
Mon Sep 2 14:16:12 UTC 2013
Lester Caine wrote:
> MY proposal is that if the database returns LMT then it is a flag
> that we are working with 'pre standard time' dates
OK, although that's a different timestamp than the one Guy Harris
was talking about. Guy Harris suggested a timestamp such that
all clocks in the named region agree after that timestamp, and
some disagree earlier. For Europe/Paris that would be some timestamp
in 1945, I expect; that information is not in the database now, and
although a number could be deduced from the Shanks & Pottenger
data it'd be almost certainly incorrect. You want a timestamp
such that time stamps before that date are LMT. For Europe/Paris
that's a timestamp in 1891, which *is* deducible from the current
database, and which is relatively reliable, at least for Paris.
You should be able to implement the flag that you want,
by consulting the current database.
More information about the tz
mailing list