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For example, I have date: 4 August 1993 and I want to add 348 days to it, how can I do it in bash?

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2 Answers

up vote 16 down vote accepted

Just use the date command with -d option:

$ date -d "1983-08-04 348 days"
Tue Jul 17 00:00:00 BST 1984

You can change the output format if you want:

$ date -d "1983-08-04 2 days" +%Y-%m-%d
1983-08-06
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You can use the OP's date format, too: date -d "4 August 1993 348 days" +"%d %B %Y" –  Dennis Williamson Sep 23 '09 at 16:54
    
According to man date: %F full date; same as %Y-%m-%d –  jperelli May 2 '12 at 21:58
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In bash on Mac OS X, you can do this:

date -j -v +348d -f "%Y-%m-%d" "1993-08-04" +%Y-%m-%d

Output: 1994-07-18

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