Calendar that also shows what state the trees are in around you could show when the next change will begin.
This would be a compass navigational tool that could show you in real time where hot spots of air pollution would be and how close you are to it. Could be used with ar glasses or app.
This could be an app that would tell you when the next or past Groundhog Day event was and if his prediction was actually right or not.
This would be a website that told you how active the squirrels are that day maybe what time they would be most active that day as well.
This could be an app that when pressing the button it would show which satellites are directly above you and how close they are maybe additional info about them if you tapped on it. Could be paired with time and which ones will be overhead next.
This could be an app for rush hour times near your location and around the world also letting you know the worst an best days to travel during it.
Fruit countdown timer giving you a window to know when to eat your fruit in depending on the fruit chosen the time will change. Could send notifications when time is running out and when you should eat it.
Disaster or emergency app that would navigate you to the nearest best spot to be in. This all depends on the type of emergency you are facing whether that be flood, fire, tornado or earthquake.
Countdown to midnight would show the most recent update to the doomsday clock and you can view when it changed and why it changed after pressing the button to see the time.
An app that could find the nearest bathroom and you can toggle between being free or having to make a purchase at that location to be able to use it. There would be a time estimate for how long it could take to get there.