To ceate a file with back dated time stamp, use thefollowing command.
touch -t 201001011030 timestamp-test
This will create a file name as "timestamp-test " with the last modified date as
2010-01(January)-01 10.30 AM.
touch -t 201001011030 timestamp-test
This will create a file name as "timestamp-test " with the last modified date as
2010-01(January)-01 10.30 AM.