I loaded the plugin but at night nothing spawns

Zombies spawn specifically at sunset and die at sunrise. So env.time 19.5ish zombies will spawn and at env.time 7ish zombies will die. 

thanks the time was the key i was skipingnight to 22.0 every time but useing 19.5 they spwan in and 7.5 they de-spwan thanks for the prompt response