expiration date for the keys pgp (automatism)

[Steffen Nurpmeso]

Werner Koch wrote in
 <875y7wvn4y.fsf at wheatstone.g10code.de>:
 |On Mon,  5 Jun 2023 14:49, broussard marc said:
 |
 |> => does pgp can tell when the key is becoming soon expired?
 |
 |That is easy on Unix:
 |
 |  $ gpg --list-keys --with-colons \
 || awk -F: -v days=60 \
 |      'BEGIN { from=systime(); to=from+(days*86400)};\

Not _that_ easy ("date +%s" maybe, strftime(3) %s is old).

  #?2|kent:$ awk 'END{print systime()}' </dev/null
  1686316851
  #?0|kent:$ mawk 'END{print systime()}' </dev/null
  1686316853
  #?0|kent:$ nawk 'END{print systime()}' </dev/null
  nawk: calling undefined function systime
   source line number 1
  #?2|kent:$ busybox.static awk 'END{print systime()}' </dev/null
  1686316860

 |       $1=="pub" && $7 > from && $7 < to { found=1 };
 |       $1=="fpr" && found {found=0; \
 |          print "key " $10 " expires in the next " days " days"}'
 |
 |A really proper solution would use a function to decode field 7 because
 |it may in the future be shown as YYYYMMDDTHHMMSS (actually gpgsm does it
 |this way).
 |
 |I will consider to allow the expiration date for the --list-filter which
 |could then be used on Windows (i.e. w/o awk) as well.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
|~~
|..and in spring, hear David Leonard sing..
|
|The black bear,          The black bear,
|blithely holds his own   holds himself at leisure
|beating it, up and down  tossing over his ups and downs with pleasure
|~~
|Farewell, dear collar bear