Обсуждение: [GENERAL] tzdata timezone boundaries
Hello,
Is there a way to have access to the tzdata boundaries from within postgres ?
the zdump linux command gives something like
------
zdump -v /usr/share/zoneinfo/America/Los_Angeles | grep 2017
Sun Mar 12 09:59:59 2017 UTC = Sun Mar 12 01:59:59 2017 PST isdst=0 gmtoff=-28800
Sun Mar 12 10:00:00 2017 UTC = Sun Mar 12 03:00:00 2017 PDT isdst=1 gmtoff=-25200
Sun Nov 5 08:59:59 2017 UTC = Sun Nov 5 01:59:59 2017 PDT isdst=1 gmtoff=-25200
Sun Nov 5 09:00:00 2017 UTC = Sun Nov 5 01:00:00 2017 PST isdst=0 gmtoff=-28800
Is there a way to have access to the tzdata boundaries from within postgres ?
the zdump linux command gives something like
------
zdump -v /usr/share/zoneinfo/America/Los_Angeles | grep 2017
Sun Mar 12 09:59:59 2017 UTC = Sun Mar 12 01:59:59 2017 PST isdst=0 gmtoff=-28800
Sun Mar 12 10:00:00 2017 UTC = Sun Mar 12 03:00:00 2017 PDT isdst=1 gmtoff=-25200
Sun Nov 5 08:59:59 2017 UTC = Sun Nov 5 01:59:59 2017 PDT isdst=1 gmtoff=-25200
Sun Nov 5 09:00:00 2017 UTC = Sun Nov 5 01:00:00 2017 PST isdst=0 gmtoff=-28800
------
I guess that postgres have access to these datas to be able to correcly handle timezone, but I can't find a way to surface these boundaries (except maybe with a smart generate_series scheme (?))
nb: I asked the question on stack overflow to no avail - https://stackoverflow.com/questions/45381924/postgresql-how-to-extract-a-list-of-past-and-known-future-offset-changes-for-a
Thanks,
Jérôme Wagner