#! perl -slw
use strict;

open EXE, '<:raw', $ARGV[0] or die "$ARGV[0] : $!";
my $dos = do{ local $/ = \65536; <EXE> };
die "$ARGV[0] is not a .exe or .dll (sig='${ \substr $dos, 0, 2 }')"
    unless substr( $dos, 0, 2 ) eq 'MZ';

my $coffoff = 8+ unpack 'x60 V', $dos;
read( EXE, $dos, $coffoff - 65536 + 4, 65536 ) or die $! 
    if $coffoff > 65536;

my $ts = unpack "x$coffoff V", $dos;

print "$ARGV[0] : ", defined $ts
    ? ( scalar( localtime $ts) || "has unfathomable timestamp value $ts" )
    : 'has no timestamp';
    
__END__
C:\cl>p:exetime.pl atlprov.dll
Sat Jan  5 11:46:16 2002

C:\cl>p:exetime.pl cl.exe
Sat Jan  5 10:48:19 2002