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#!/usr/bin/perl
use 5.014;
# convert TZ 
...
    local $ENV{TZ} = "IST-05:30";                  # does not return c
+orrect time on W7
    say "In Mumbai, it is " . localtime();         # but, rather, same
+ as NY localtime
}

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$ENV{TZ}: EST5EDT                            # TZ is set but this does
+ 
                                             # not appear to be defaul
+t (for Win7)
In New York, it is Mon Apr  2 10:41:23 2012  # correct
In Mumbai, it is Mon Apr  2 10:41:23 2012    #obviously wrong