Search Spotlight for a file of specific type between two dates
The date format needs to be same as the one that you set in system preference



If your date format is same as the screenshot attached, then the search will become:

kind:pages modified:&gt;11/20/15 modified:&lt;=11/26/15

Otherwise, you'll need to change the date format to the one that you have set in your Language &amp; Region (screenshot)