UNIX for Dummies Questions & Answers

#! /usr/bin/ksh

typeset -Z2 ehour eminute esecond

Start="09/03/02 04:15:02"
Finish="09/04/02 07:13:51"

IFS=" /:"
echo $Start | read smonth sday syear shour sminute ssecond
echo $Finish | read fmonth fday fyear fhour fminute fsecond
IFS=""

((syear=syear+2000))
((fyear=fyear+2000))
sjd=$(datecalc -j $syear $smonth $sday)
fjd=$(datecalc -j $fyear $fmonth $fday)
((days=fjd-sjd))
((extra=days*24))
((start=((shour*60)+sminute)*60+ssecond))
((finish=(((extra+fhour)*60)+fminute)*60+fsecond))
((elasped=finish-start))
((ehour=elasped/3600))
((elasped=elasped%3600))
((eminute=elasped/60))
((esecond=elasped%60))

echo $Finish
echo $Start
echo ${ehour}:${eminute}:${esecond}
exit 0