[tz] How good is pre-1970 time zone history represented in TZ database?

Lester Caine lester at lsces.uk
Wed Jun 3 11:03:31 UTC 2020

On 03/06/2020 11:01, Alois Treindl wrote:
> It is known that pre-1970 time zone history is represented in TZ 
> database only for the cities which define the zone names.
> Other areas of countries are often not correctly represented in TZ 
> database before 1970.

In Europe, there are several rules pushed back to the backzone file 
which are accurate for all of the times back to the introduction of 
'standard time' but if backzone is omitted from the TZ data then those 
areas fall back to the general rules from the current set prior to 1970. 
In particular the data during the Second World War for The islands 
around the UK is missed. The amount of missing data is only small, but 
the fact that it is missing is not always obvious?

Lester Caine - G8HFL
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