die "$0: either -j or -s, not both\n"
if $opt_j && $opt_s;
-my $ctime_re = qr/(Sun|Mon|Tue|Wed|Thu|Fri|Sat) (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) [ 123][0-9] [0-2][0-9]:[0-5][0-9]:[0-6][0-9] [0-9][0-9][0-9][0-9]/;
+my $dow_re = qr/(Sun|Mon|Tue|Wed|Thu|Fri|Sat)/;
+my $mon_re = qr/(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)/;
+my $tod_re = qr/[0-2][0-9]:[0-5][0-9]:[0-6][0-9]/;
+my $year_re = qr/[0-9][0-9][0-9][0-9]/;
+my $ctime19_re = qr/$dow_re $mon_re [ 123][0-9] $tod_re/;
+my $ctime_re = qr/$dow_re $mon_re [ 123][0-9] $tod_re $year_re/;
+my $fmttime2822_re = qr/$dow_re, [0123][0-9] $mon_re $year_re $tod_re [-+][0-9][0-9][0-9][0-9]/;
my $xdfld_re = qr/\([^)]*\)|[^ (][^ ]*/;
# Current dump, if any
sub norm_ctime {
my ($s) = @_;
$s =~ s/$ctime_re/Thu Jan 1 00:00:00 1970/g;
+ $s =~ s/$ctime19_re/Thu Jan 1 00:00:00/g;
+ $s =~ s/$fmttime2822_re/Thu, 01 Jan 1970 00:00:00 +0000/g;
return $s;
}