How do I play a sound (or make any event happen) at specific time of day?

I need to make different sounds for day and night in my level. I want birds when it’s day, and crickets when it’s night. But I want to make them depend on the time of day specified by the night and day system I bought from the Marketplace. Dynamic Sky System
If anyone has it, could you point me to the right direction please?

I know I don’t want to use timers because I want to be able to start the game at any time of day and the sounds to follow.