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#!/bin/ksh93

date1="20130714"
date2="20130717"

startdate=${date1:0:4}"-"${date1:4:2}"-"${date1:6:2}
i=0

while :
do
(( i++ ))
datex=$(printf "%(%Y%m%d)T\n" "${startdate} + $i...

try expr index "$ulab" ' '

Without the quotes, $ulab splits into two strings on the commandline.