Please set your birthday or your acquaintance birthday. Number of days from birth will be displayed.
If you purchase the paid version, you can check the number of days on the home screen even if the app does not open.
Notes for customers who have purchased the paid version
If you have disabled notifications in your iPhone or iPad settings, the date will not be displayed above the icon.
Open your iPhone or iPad settings to enable notifications for this app in the notification settings, and please also set the "icon badge" to ON.