How can I have a database set up that automaticly changes a value at the end of the day, for example tracking how many hours a user has been online, and at 12:00 it sets all the values in the column "hours" to 0, except I want it to do this without any one having to manually typing the code when it is 12:00 (I want it automated so I do not have to input code at 12:00 or open a webpage at 12:00).