unix - Get the date (a day before current time) in Bash

Question

How can I print the date which is a day before current time in Bash?

Answer 1

if you have GNU date and i understood you correctly

$ date +%Y:%m:%d -d "yesterday"
2009:11:09

or

$ date +%Y:%m:%d -d "1 day ago"
2009:11:09