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Re: display-time-world & EDT/DST
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From: |
Jason Rumney |
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Subject: |
Re: display-time-world & EDT/DST |
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Date: |
Wed, 27 Jun 2012 19:18:32 -0700 (PDT) |
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User-agent: |
G2/1.0 |
On Wednesday, 27 June 2012 17:39:05 UTC+8, Jambunathan K wrote:
> ,----[ C-h v display-time-world-list RET ]
> | display-time-world-list is a variable defined in `time.el'.
> | Its value is (("PST8PDT" "Seattle")
> | ("EST5EDT" "New York")
> | ("GMT0BST" "London")
> | ("CET-1CDT" "Paris")
> | ("IST-5:30" "Bangalore") <=== Why this ''minus''. Isn't IST = GMT+5:30?
> | ("JST-9" "Tokyo"))
> |
The history of the development of computer software is largely a US one. When
the TZ offset format was defined, US timezones were defined as positive. So we
ended up with a backwards system, where the TZ offset is actually specifying
how many hours you need to SUBTRACT from UTC to get local time.