#!/usr/bin/perl
use 5.014;
# convert TZ 

say "\$ENV{TZ}: $ENV{TZ}";     # var had to be manually added on stock W7


{
    local $ENV{TZ} = "EST+05";
    say "In New York, it is " . localtime();
}

{
    local $ENV{TZ} = "IST-05:30";                  # does not return correct time on W7
    say "In Mumbai, it is " . localtime();         # but, rather, same as NY localtime
}