You can use the find command with the various keys -mtime -ctime and -atime
Quote from this link: http://www.softpanorama.org/Tools/Find/selecting_files_by_age.shtml
To find html files that have changed over the past seven 24-hour periods (days), I can use -mtime with the -7 argument (including a hyphen):
find . -mtime -7 -name "*.html" -print
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