find / -atime +1 # fild all files starting at / accessed 1 day ago.
find / -atime +1 </tmp/fileage # put list of files starting at / into a tmp file called fileage

find . -atime +1 -type f -exec mv {} TMP \; # mv files accessed (in . dirspec) from 1 day to dir TMP

Note differences between atime, ctime and mtime:

"-atime/-ctime/-mtime" 
	[+|-]n

	Specify selection of the files based on  three 
	Unix timestamps: the last time 
	a files's "access time", "file status" and "modification time".    
	

	n  is time 
	interval -- an integer with optional sign. It is measured in 
	24-hour periods (days) or minutes counted from the current moment.

• n: If the integer n does not have sign this means exactly n 24-hour periods (days) ago, 0 means today.
  
• +n: if it has plus sing, then it means "more then n 24-hour periods (days) ago", or older then n,
  
• -n: if it has the minus sign, then it means less than n 24-hour periods (days) ago (-n), or younger then n. It's evident that -1,  and 0 are the same and both means "today".

http://www.wagoneers.com/UNIX/FIND/find-usage.html