Lịch Vạn Niên 2023 is a free iPhone application developed by Phung Doanh for those who want to check lunar and solar calendars quickly and conveniently. This app allows you to view information about the day, month, year, and the zodiac hours of the day. It also provides users with over 10,000 proverbs, sayings, and more than 1,000 wallpapers divided into different themes.

The app's main functions include a calendar for both lunar and solar dates, zodiac hours, and information about festivals and holidays in Vietnam. You can customize the background and quotes according to your preferences. Additionally, you can check your horoscope, personality traits based on blood types, and name-based fortune-telling. The app also includes hundreds of traditional Vietnamese customs, along with more than 1,000 useful life hacks.