perl code to grep a particular coulumn in CSV format

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http://www.unix.com – Hi I want to grep a column 6 & column 7 from a CSV Format file & then i have to find the difference between these columns as these both columns contains date & time in 7/7/2012 9:20 this format . So kindly help me out ASAP. But please kindly dis xls has to be converted in csv format as may data will be in csv format. Attached Files New.xls (22.5 KB) (HowTos)