The find utility has an option to find a file newer than another file. By creating an empty file with a specific creation date we can do the search:
touch timestamp -d 2010-01-01
To show all files newer than 2010-01-01 use:
find . -newer timestamp
Or to create a tar archive of them use xargs like so:
find . -newer timestamp | xargs tar -rf /root/filesnewerthan-2010-01-01.tar
Easy.

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