[openstreetmap/openstreetmap-website] Switch to TIMESTAMP WITH TIME ZONE for current_* tables (#375)
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Wed Nov 21 11:13:59 UTC 2018
> Surely "with timezone" has to store the timezone? The actual time might be normalised to UTC but it has to store the original timezone as well so it can return it. That's the whole point right?
No, that's not how it works! :-) There's no offset stored, the information about the original timezone is ignored. If you store somethings as ".....10:05Z+0800" into a `timestamp with timezone` then it just gets stored as "....18:05UTC". Like I say, I think the column type names are a bit misleading.
https://stackoverflow.com/a/9576170/105451 is another good article. It notes "The time zone itself is never stored. It is an input modifier used to compute the according UTC timestamp, which is stored - or and output modifier used to compute the local time to display - with appended time zone offset."
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