[PATCH 1/2] [BZ #16141] strptime: extend %z range to UTC+14:00

[Paul Eggert]

James Perkins wrote:
> Extending the valid positive timezone offset to +14:00 allows
> for the correct parsing of several timezone offsets

Why stop with the range -12..+14?  A wider range is needed to support past 
historical timestamps, e.g., when the Philippines used American time and NW 
North America used Asian:

$ TZ=Asia/Manila date -d@-4039286400 --rfc-3339=seconds
1841-12-31 08:04:00-15:56
$ TZ=America/Juneau date -d@-4039286400 --rfc-3339=seconds
1842-01-01 15:02:19+15:02

Also, POSIX allows the range -24 .. +25 for the hours field:

$ TZ=XXX-24:59YYY,2,1 date -d@0 --rfc-3339=seconds
1970-01-02 01:59:00+25:59
$ TZ=ZZZ24:59 date -d@0 --rfc-3339=seconds
1969-12-30 23:01:00-24:59

So I suggest allowing at least -24 .. +25.