On 11/05/18 20:37, Adriano dos Santos Fernandes wrote:
* PST is Pitcairn or Pacific, with the same offset, they are
considered different time zones
ICU data is derived from TZ data hosted by IANA
(http://site.icu-project.org/tznotice).
I really can't answer questions about specific time zones, but really
grateful if we can clarify them.
The abbreviations are not defined to be unique. Only a subset of them
can be used as identifiers, the rest are only 'defined' when associated
with a particular rule, so are only suitable for displaying.
Personally I need to see the different UK/Ireland timezone idents giving
the right offsets prior to 1970 and that depends on how the ICU extract
has been processed. It's not a case that 'the ICU data is derived from
TZ data', it also depends on how the TZ data is processed by ICU and I'm
not seeing ANY information on that. For the Irish area we then get IST
standing for Irish Summer Time prior to 1968, and Irish Standard Time
after that. Nothing is easy on any of this ... and IST is used in a
number of other rules with similar differences in expansion. A quick
scan of the ICU files would suggest 'IST' is used by them for India
Standard Time but it would be nice if there was an easy way to confirm
that? Certainly I'm not seeing data in zoneinfo64.txt for Isle of man,
Jersey, Guernsey or Belfast so I suspect they are not valid pre-1970 :(
--
Lester Caine - G8HFL
-----------------------------
Contact - http://lsces.co.uk/wiki/?page=contact
L.S.Caine Electronic Services - http://lsces.co.uk
EnquirySolve - http://enquirysolve.com/
Model Engineers Digital Workshop - http://medw.co.uk
Rainbow Digital Media - http://rainbowdigitalmedia.co.uk
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
Firebird-Devel mailing list, web interface at
https://lists.sourceforge.net/lists/listinfo/firebird-devel
