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Sometimes, when working on a new machine or a machine with a screwy clock or incorrect TZ you can then have files modified in the future which breaks some things. 

To find the files modified in the future use

<code>find ./ -type f -newermt "1 days"</code>

Now to fix the files to NOW use

<code>find ./ -type f -newermt "5 days"|xargs touch</code>

You can use -d with touch to specify the date you want to use instead of now. 

How about finding all files that have not been modified for more than 20 years? 

<code>find ./ -type f -mtime +7300</code>

The +7300 is 20*365 or 20 years. If you wanted to delete these files then -delete will do it. If you wanted to archive these files then output the filenames to a file with > filename.txt and then either sed that into cp commands or feed it into the cp.