Input Date to mm/dd/yy

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http://www.unix.com – Hi, I am new to unix and I am doing following steps : 1. Ask user to enter date in mm-dd-yyyy format. 2. show the date user entered from step #1 . 3. convert user enter date into YYYY/MM/DD format. Here is the script I am using Code: echo "Please enter the date in mm-dd-yyyy format: " read X #export date=$X echo "Date you entered is $X" a=$X+"%y/%m/%d" echo $a The problem here the date does not covert to YYY/MM/DD , can somebody please help me. Thanks (HowTos)