WIth this creation here you can Create a door which will only open to people outside if it is either daytime or nighttime. It uses the logic of the Villagers, who mostly stay outside during the day and go inside fully when it's night. The idea to such a "time detector" did not come from me, I saw it in a Video of Captain Sparklez. He himself used it for turning redstone lamps on during the night.

For this to Work the area outside of the Pressure pad room must be open, but you seemingly keep it open when using Trap doors.