ssh-keygen -V doesn't respect DST

[Thorsten Glaser]

On Mon, 28 Mar 2022, Darren Tucker wrote:

> +	tm.tm_isdst = -1;  /* auto detect DST */

Despite this being precisely what POSIX’ strptime docs say…

https://pubs.opengroup.org/onlinepubs/9699919799/functions/strptime.html#tag_16_582_06

… tm_isdst is optional, and therefore this needs #ifdef HAVE_TM_ISDST
and a configure test. (Also, ouch, I didn’t know about this either;
very unintuitive API combination.)

bye,
//mirabilos
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