Zbigniew Jędrzejewski-Szmek wrote: > I'm not sure why it's in UTC and not some DST zone. It might even have > been on purpose. I wasn't involved in that decision but I can tell you one simple and obvious reason to specify times in UTC: Everybody needs to know only their own current offset from UTC, and can convert to their local time with a single addition. If a time and an offset are specified, then everybody needs to subtract that offset and then add their own offset, so that requires slightly more mental arithmetic. If an acronym like "HKT" is given instead of an offset, then everybody must either know what offset that acronym stands for, or look it up before they can convert the time. That's much less friendly to the reader. Even worse is to specify a timezone by geographical name. Then the reader needs to find out whether time jumps are practised in that zone, and on what days, before they can know what the offset is in that zone at the time. Then they can subtract that offset, and finally add their own offset. Times specified this way will also be ambiguous each time that timezone jumps backwards. So obviously UTC works best for agreeing on a meeting time across borders. Björn Persson
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