On 14/06/2019 14:27, Adriano dos Santos Fernandes wrote:
Note that ICU is a theoretical implementation detail, so Firebird has a
gateway for it also in the client to not reimplement it. But this is
important: at least currently, ICU is an implementation detail.
Currently if Firebird wants to implement some time zone not present in
ICU, it can. Not saying it should.
My own problem is the the use of The smaller UK timezone ID's ... Isle
of Man, Guernsey and Jersey ... which on most systems are only accurate
post 1970. Although ICU does not currently identify if that is the case.
World War 2 archival material can not reliably use the rules supplied
because different systems may not have the proper pre-1970 data :( We do
not actually have any indication if the rule set is valid pre-1970. This
is a basic implementation detail for any system trying to use TZ data :(
--
Lester Caine - G8HFL
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