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?

Answer 1

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