Need small help!

[VIPERS]

Good morning gods of web!

I create a small and easy java game (similar a slot machine) for my user.
Now i would like put a reward system with fixed number of plays in 24 hours.

example:

An user can do max 1 spin every 24 hours and this win must be accumulate in the own account after that can exchange points with rewards or other.

I know it's very easy to do but i don't remember how can i do... D:

 

Edited July 14, 2015 by VIPERS

[JohnOne]

Code will help

Edited July 14, 2015 by JohnOne