Bug 22279

Perl's POSIX module is a wrapper for common POSIX routines... one of the functions in this module is strftime.

It works as expected, unless you make use of the %Z spec (returns ???).
Making use of strftime via a c program results in correct behavior (returns PDT).

How-To-Repeat: Perl script:
perl -MPOSIX -e 'print(strftime("%Z", (localtime)), "\n");'
# prints "???"

C script:
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
int main(void) {
        char buff[4];
        time_t now = time(NULL);
        strftime(buff, sizeof(buff), "%Z", localtime(&now) );
        printf("%s\n", buff);
        return;
}
// prints 'PDT'