$ date -d '1 day ago'; date -d '11 hour ago'; date -d '2 hour ago - 3 minute'; date -d '16 hour'
With this command you can get a previous or future date or time. Where can you use this? How about finding all files modified or created in the last 5 mins?
touch -t `echo $(date -d "5 minute ago" "+%G%m%d%H%M.%S")` me && find . -type f -newer me
List all directories created since last week?
touch -t `echo $(date -d "1 week ago" "+%G%m%d%H%M.%S")` me && find . -type d -cnewer me
I'm sure you can think of more ways to use it. Requires coreutils package.
by David Winterbottom (codeinthehole.com)