--- b	2010-02-02 12:05:17.000000000 -0500
+++ a	2010-02-02 12:05:00.000000000 -0500
@@ -2,6 +2,10 @@
  $s = "";
  $m = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ_abcdefghijkmnopqrstuvwxyz";
  if ($n===undefined || $n===0) { return 0; }
+ if($n<0) {
+  $n = $n*-1;
+  $s .= '-';
+ }
  while ($n>0) {
    $d = $n % 60;
    $s = strcat($m[$d],$s);