format a number string to date

Question

In a bash script, I have a variable like :

date=20140131

which means 31 Jan 2014. How can I add one day to it? I mean how can I add one value to "date" to change it to "20140201" (1 Fab 2014) not "20140132"

Answer 1

with GNU date

$  d=20140131
$  date -d "$d +1 day" +%Y%m%d

20140201 

If you don't have gnu date, here is the script I used mostly (refer http://www.unix.com/16559-post2.html )

so if you need get the next day of 20140131, you can run:

datecalc -a 2014 01 31 + 1