Make 2 files that will be the marking point of the beginning and the end.

Then delete everything between those 2 days:

In english that command means:
Find all files in this folder (and recursively down) that are newer than start_date_file_name and not newer than end_date_file_name, then run rm -f on each of those files.

To see what is being deleted:

Delete every file newer than 1990/01/01 and older than 2013/01/01 in this folder (not recusively down)

Another Article:
Find & Delete files older and newer than X days. (not by date, but age). Another article on same topic: Deleting files by age

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