Minecraft wiki entry for Predicate, associated text: time_check—Compares the current game time (the age of the world in game ticks) against given values. Invokable from any context.
 value: The time to compare the game time against.
 min: Number Provider. The minimum value.
 max: Number Provider. The maximum value.
 value: Shorthand version of  value above, used to check for a single value only. Number providers cannot be used in this shorthand form.
 period: If present, the game time is first reduced modulo the given number before being checked against  value. For example, setting this to 24000 causes the checked time to be equal to the current daytime.