[tz] How good is pre-1970 time zone history represented in TZ database?
lester at lsces.uk
Wed Jun 3 11:22:32 UTC 2020
On 03/06/2020 12:09, Alois Treindl wrote:
> The backzone zones cover only a very small part of the problems we know
> Using the backzone prevents using the official tzdata distribution, as
> one has to compile with special procedures so that backzone data are
> compiled in.
> This would prevent us from using the official tzdata packages provided
> automatically for Redhat Enterprise Linux.
THAT has been my own complaint for years ... tzdist at least accepted
that some rule sets are only valid for a reduced timeframe, and report
that fact, but as yet there are no sources of this more accurate data as
yet? A tzdist publisher would have the ability of improving their own
historic data and in addition flag when rules have changed from when a
previous normalization was applied. The CURRENT problem is even when
present day time offsets change, a distribution will simply apply the
new rules without any flagging that currently stored data may now be
incorrect. One needs to be able to view the rule used for the stored
data in parallel with the new rule even if only to flag human
intervention is needed.
Lester Caine - G8HFL
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