change date of directory and file

["Nabin Limbu" <nlimbu healthnet org np>]

Hi,
If we change any file and save it or create any directory then the created date and 
time of the file or directory will be also be attached with the file. Is there anyway to 
change this "date and time" only of the exitsting directory and file without saving 
them again.

Regards
Nabin Limbu