For the time of day, you can do the following on any item really:
this addAction ["Change Day/Night",{skipTime 12}];
or for a little added flavor:
this addAction ["Change Day/Night",{titleText ["Several Hours Later..", "BLACK OUT", 2];sleep 4;skipTime 12;titleText ["", "BLACK IN", 2];}];
Although, it may need to be used with remoteExec or something similar if you are playing with a friend. I don't believe the skiptime will be MP friendly