$ apropos localtime
localtime [ctime]    (3)  - transform date and time to broken-down time or ASCII
timegm               (3)  - inverses for gmtime and localtime
Time::localtime      (3pm)  - by-name interface to Perl's built-in localtime() function
timelocal [timegm]   (3)  - inverses for gmtime and localtime
Time::tm             (3pm)  - internal object used by Time::gmtime and Time::localtime
$