yes you can use two interfaces, but you have to make something make it pop up, think of it as a Teleport interface. or bank, bank has mulitple interfaces along with clicking buttons, it will be quite hard adding day and night, because how will you make it switch for everyone. even with ticks, it would save to the account, so it will be day time for certain people and night time for others. it's a cool idea, but it will take quite some time to perfect it. good luck.