Free tools
Vietnamese lunar date converter
Enter your wedding date in either calendar to see the other, the weekday and the year's name — with the lunar-date line ready to copy onto your invitation.
Enter a date to see the result.
How to use
Choose a direction: from a Gregorian date to the lunar calendar, or from a lunar date back.
Enter your wedding date. For lunar dates, tick “Leap month” if the day falls in a leap month.
Read the weekday, the lunar date and the year's name, then copy the ready-made line for your invitation.
The lunar date on a Vietnamese invitation
Vietnamese invitations usually give the Gregorian date first and the lunar date in brackets. Older relatives check the lunar date, so getting a single number wrong is the first thing anyone notices.
The lunar year doesn't turn over with the Gregorian one. The Year of Đinh Mùi begins on 6 February 2027, so a wedding in January 2027 still falls in the Year of Bính Ngọ.
The tool uses the same astronomical algorithm and Vietnam time zone (UTC+7) that Keemori uses to print lunar dates on invitations, so the numbers here match the ones on your card.
Frequently asked questions
It uses Hồ Ngọc Đức's algorithm in the Vietnam time zone (UTC+7), the common way the Vietnamese lunar calendar is computed today. For an important date, families may still double-check against a printed calendar.
Most of 2026 is the Year of Bính Ngọ. The Year of Đinh Mùi starts at lunar new year, on 6 February 2027, so the days before it in early 2027 still belong to Bính Ngọ.
Add “nhuận” after the month, as in “tháng 6 nhuận”. 2025 has a leap sixth month; the tool detects it automatically when converting from a Gregorian date.
No. The tool only converts dates. Many families ask an elder or a date reader to choose the day — ask early, since you also need the venue to be free.
Other tools
Got the date and the guest count? Time for the invitation.
Order a custom-designed online wedding invitation and get a link and QR code to share on Zalo or Messenger.