perldoc Time::localtime

DESCRIPTION
This module's default exports override the core localtime() function ...

perldoc POSIX

localtime
        This is identical to Perl's builtin "localtime()" function for
        converting seconds since the epoch to a date see "localtime" in
        perlfunc.

This is mostly true. The difference is that POSIX::localtime demands you pass it an argument, while CORE::localtime does not (it assumes the value of time):

C:\>perl -e"die ~~localtime"
Sat Jun 21 05:23:53 2003 at -e line 1.

C:\>perl -MPOSIX=localtime -e"die ~~localtime"
Usage: POSIX::localtime(time) at -e line 1

C:\>
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