iPad & iPhone

Birthdays - Countdown & Track
Utilities
School Days Counter & Widget
Working Days Counter & Widget
Progress - Goal Tracker
Productivity
Recurrence - Task List Manager
Productivity
Countdowns - Event Countdown

Apple Watch

Mac

School Days Counter & Widget
Working Days Counter & Widget
Progress - Goal Tracker
Productivity
Recurrence - Task List Manager
Productivity
Countdowns - Event Countdown