In Unix-like operating systems, including Linux, Mac, BSD and Windows Subsystem for Linux, you can search for all files modified in the last 60 days. Of course, you might as well search for a particular file extension if you know it.

find ~ -name '*.m' -type f -mtime -60

-name "*.m"

You need to enclose in quotes " " to avoid the shell expanding the asterisk into a giant list of files. This parameter is optional

-type f

save time by searching only files, not directories (especially helpful the other way around where you want only directories)

-mtime -60

searches for files modified within the last 60 days (not older files)