The Special Days is a free lifestyle app developed by SmartWho for Android users. The app allows the user to register and keep track of special days such as anniversaries, birthdays, and other important events. With a simple and user-friendly interface, the app provides custom calculations optimized for various events like lunar calculations, baby months, and more.

One of the key features of The Special Days is its automatic anniversary calculation, which allows the user to check 100 days and 200 days before and after the anniversary, as well as the 1st and 2nd anniversary. The app also provides reminders for each anniversary. Additionally, the app has a backup and recovery function that allows the user to backup and recover anniversary data.

The app offers a variety of event calculations such as D-day, number of days, months, weeks, year, month, day, and repeat every month, year, and week. Users can also calculate lunar birthdays, exams, children's birthdays, and parents' birthdays. The app also provides a calendar function and a date calculator that allows users to calculate the number of days between two dates. The app requires the [ media file write permission (WRITE_EXTERNAL_STORAGE) ] to save an image symbolizing anniversaries in the app and giving a notification.