dayplays.php will reset "Game Plays Today" in the stats block.
you can run a cron job that will run this file once a day.

**How to set up a cron job in cPanel**

go to Cron jobs in cpanel.
click on standard.

Command to run:
php -q /home/username/public_html/cron/dayplays.php
Minute(s):
0
Hour(s):
0 = 12 AM/Midnight
Day(s):
Every Day
Months(s):
Every Month
Weekday(s):
Every Weekday