how to add a day to date in bash?

Question

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

Dave Webb · Answer 1 · 2009-09-23 13:54:21Z

up vote 10 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

answered Sep 23 '09 at 13:54

Dave Webb
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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 at 21:58

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