Man pages matching name posix::strptime in section 3pm:

POSIX::strptime.3pm.en	debian 10 / libposix-strptime-perl
POSIX::strptime.3pm.en	debian 11 / libposix-strptime-perl
POSIX::strptime.3pm.en	debian 12 / libposix-strptime-perl