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$ perl -MDate::Parse -E'say scalar gmtime str2time("08/Oct/2007:04:54: +20 -0400");' Mon Oct 8 08:54:20 2007
%months = ( Jan => '01', Feb => '02', ... ); s!(..)/(...)/(....):(..):(..):(..)!$3.$months{$2}.$1.$4.$5.$6!e;