mtime or find old files or delete old files

If you want to find old files, i.e. find files greater that 30 days using following command

Find and Print Files:-
find -type f -name <'Search pattern*'> -mtime +30 -print

Delete files greater than 30 days:-(Time is important in this)
find /cba_app/WSSORD01/DEV/archive/outbound -name DLMASY* -mtime +30 -exec rm {} \;

Good site for reference
http://www.unix.com/tips-tutorials/20526-mtime-ctime-atime.html

Create Files as backdated files

If you want to create files in UNIX as backdated files, i.e. file creation date as old dates, follow below steps or commands.

Syntax:-
touch
This will create a file of that specific Month, Date for that year.

Example:-
touch 03302200 SAMPLE_20120330000000.txt;