based on :
Subject: [perl #49914] gmtime()/localtime() do not use time()
From: Abe Timmerman (via RT) <perlbug-followup@perl.org>
Message-ID: <rt-3.6.HEAD-18434-
1200621906-376.49914-75-0@perl.org>
p4raw-id: //depot/perl@33095
C<$isdst> is true if the specified time occurs during Daylight Saving
Time, false otherwise.
-If EXPR is omitted, C<localtime()> uses the current time (C<localtime(time)>).
+If EXPR is omitted, C<localtime()> uses the current time (as returned
+by the C<time()> built-in).
In scalar context, C<localtime()> returns the ctime(3) value: