--- lib/scripts/showtime.orig	Mon Jun 21 18:25:58 2004
+++ lib/scripts/showtime	Sun Sep  2 19:05:48 2007
@@ -1,18 +1,18 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # $Id: showtime,v 1.5 2004/06/21 08:25:58 kleing Exp $
 # Author: Markus Wenzel, TU Muenchen
 #
 # showtime - print time.
 
-TIME="$1"
+TIME=$(( `date +'%j * 86400 + %H * 3600 + %M * 60 + %S'` - "$1" ))
 
-SECS=$[ $TIME % 60 ]
+SECS=$(( $TIME % 60 ))
 [ $SECS -lt 10 ] && SECS="0$SECS"
 
-MINUTES=$[ ($TIME / 60) % 60 ]
+MINUTES=$(( ($TIME / 60) % 60 ))
 [ $MINUTES -lt 10 ] && MINUTES="0$MINUTES"
 
-HOURS=$[ $TIME / 3600 ]
+HOURS=$(( $TIME / 3600 ))
 
 echo "${HOURS}:${MINUTES}:${SECS}"