You use the ’touch’ command to create two blank files, with a last modified date that you specify - one with a date of the start of the range you want to specify, and the second with a date at the end of the range you want to specify. Then you reference to those two files in your find command:
touch /tmp/temp -t 200604141130
touch /tmp/ntemp -t 200604261630
find /data/ -cnewer /tmp/temp -and ! -cnewer /tmp/ntemp