[tz] Amsterdam timezone prior to 1937 incorrect?

Derick Rethans tz at derickrethans.nl
Tue Sep 6 16:18:39 UTC 2022

On 5 September 2022 20:34:06 BST, Loek Engels via tz <tz at iana.org> wrote:
>Between 2022a an b the timezone info for Europe/Amstedam is removed:
>      Z Europe/Amsterdam 0:19:32 - LMT 1835
>The timezone info for Brussels around that date differs from Amsterdams timezone info.
>Determining the timezone information for dates around that period on my Linux system in python returns since the latest update an offset of 0 minutes as opposed to the 19 minutes previously.
>Is the removal for this timezone information intentional or a bug?

The maintainer has merged the Amsterdam and Brussels timezone information by using the Brussels rules for Amsterdam, as the rules don't differ since 1970, in the default data package. This wipes out Amsterdam rules from before 1970, including local mean time. 

The old data is still available if you build with certain (IMO hard to find, slightly documented) options. 


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