[tz] something wrong with 2021b zdump
eggert at cs.ucla.edu
Wed Sep 29 09:15:24 UTC 2021
On 9/28/21 5:38 PM, 大山俊成 via tz wrote:
> I don't understand the meaning for line 3-5,20-22 of 2021b result. Is it correct ?
I think it's correct, unless you're seeing something I don't.
2021b zdump changed as noted in NEWS; look for "zdump -v now outputs
timestamps at boundaries of what localtime and gmtime can represent".
You can see the full documentation and source-code change here:
zdump -v's new output differs from (and is intended to be more useful
than) the old zdump -v output. For example, where the old zdump -v would
have output the following, which doesn't correspond to any transition at
Pacific/Honolulu -9223372036854689408 = NULL
the new zdump -v outputs the following for the two transitions at
(-67768040609740801) → (Thu Jan 1 00:00:00 -2147481748 UT), when gmtime
starts succeeding, and at (Thu Jan 1 10:31:25 -2147481748 UT) → (Thu
Jan 1 10:31:26 -2147481748 UT), when localtime starts succeeding:
Pacific/Honolulu -67768040609740801 = NULL
Pacific/Honolulu Thu Jan 1 00:00:00 -2147481748 UT = NULL
Pacific/Honolulu Thu Jan 1 10:31:25 -2147481748 UT = NULL
Pacific/Honolulu Thu Jan 1 10:31:26 -2147481748 UT = Thu Jan 1
00:00:00 -2147481748 LMT isdst=0 gmtoff=-37886
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