MyCntdwn is the best countdown app on the iPhone.
MyCntdwn (short for My Countdown) is a simple application that allows you to set events in the future and then have an easy way to see how long is left before the event gets here. You can use it for events like vacations, weddings, holidays, etc.
MyCntdwn is the perfect way to show the kids the number of days left until Christmas (or their birthday).
This update requires iOS 9 or greater to run.