Universal Night time announcement

Does anyone have or know how to have a message pop up at night telling people that it is night time and when it is morning. There is a plugin that does this called 'Killing only at nighttime' It makes a message pop up at night telling you when its time to kill and morning when to stop, but that plugin stops you killing in day altogether and i don't want that, i want you to still be able to kill in day.

 

Never mind. I found out how to do it.