Perpetual calendar See good and bad days - Lunisolar calendar - see the most popular good and bad days with more than 1 million downloads ★★★★★ ★ Perpetual Calendar application to see good and bad days (Vietnamese calendar to see good and bad days - lunar calendar) also known as Van Su Calendar, the best Lich Van Nien application. It is an indispensable utility in your phone, helping you easily look up lunisolar date information and see the most accurate good and bad days. The App has a new fu