my %daily_total;
my %hourly_stats;

while (<DATA>) {
	# looking for: 06/05/2008  8:31a
	if (m{\d\d/(\d\d)/\d{4}\s{1,2}(\d+):(\d\d)(a|p)}) {
	  my $day = $1;     # get day
	  my $hour = sprintf "%02d", $2; # get hour
	  my $minute = $3;  # get minutes
	  my $ampm = $4;    # get am or pm
	
	  if ($ampm eq "p" && $hour != 12) {$hour += 12; }
	  $hour = '00' if $ampm eq "a" && $hour == 12;
	
	  $daily_total{$day}++;
	  $hourly_stats{$day}{$hour}{total}++;
	
	  if ($minute <= 29) {
	    $hourly_stats{$day}{$hour}{HalfHour00}++;
	  }
	  else {
	    $hourly_stats{$day}{$hour}{HalfHour30}++;
	  }
	}
}

for my $day (sort keys %daily_total) {
	print "day: $day, total: $daily_total{$day}\n";
	for my $hour (sort keys %{ $hourly_stats{$day} }) {
		print "hour: $hour\n";
		print "   first 1/2 hr: ", $hourly_stats{$day}{$hour}{HalfHour00}|| 0,"\n";
		print "   second 1/2 hr: ",$hourly_stats{$day}{$hour}{HalfHour30}|| 0,"\n";
		print "   total/hour: $hourly_stats{$day}{$hour}{total}\n";
	}
	print "\n";
}