This is a free traditional Vietnamese calendar (Van Nien) application that can be used to look up all years, with the most accurate time calculated to the minute unit. It is also useful for Vietnamese people to use.

It is designed to be used as a reference, so that you can quickly identify the armor patch and know the good/bad time for each year.

The application is a combination of a calendar and a reference book, so that it can be used as a calendar for your home screen and lock screen. No need to open the application, just open your device to see the calendar.