Keeping Your Life On Time.
TillTime is a simple and easy to-do/countdown app, keeping track of a list of things to do or events that will happen. Check on how long you have to get everything done, or how long to wait until that big day/event/etc., with a simple glance.
All events are kept in sync between multiple devices via iCloud. List can be sorted in ascending or descending order of time-remaining-until-event independently on all devices.
Simple and easy, no worries, app. Free to download, the app is ad-supported.