[tz] Issues with pre-1970 information in TZDB

Tom Lane tgl at sss.pgh.pa.us
Thu Sep 23 20:12:04 UTC 2021

Guy Harris <gharris at sonic.net> writes:
> On Sep 23, 2021, at 10:31 AM, Tom Lane via tz <tz at iana.org> wrote:
>> That's fine, but if that is the policy, then the data should in fact be
>> valid (to the best of our ability) for the named location.  It's not okay
>> to present data for Europe/Oslo that is simply known incorrect for Oslo.
>> Whether it's exact for anywhere else in Norway is a red herring.

> So what is a given tzid supposed to refer to when using it for pre-1970 data?  The city in its name, and no other location on Earth?

Why not?  That would seem to be the obvious interpretation.  Besides
which, the existing practice of citing LMT for pre-standardization
dates already limits any arguable exactitude to the city's meridian.

			regards, tom lane

More information about the tz mailing list