Free tool
Convert lunar and solar dates on the Vietnamese calendar
Pick a solar date to see its lunar date, Can Chi and solar term — or go the other way when the family has chosen a day on the lunar calendar. Calculated on Vietnam time (GMT+7), leap months included.
- Converts both ways
- Handles leap months
- Can Chi for day, month and year
- Calculated on your device
Convert lunar and solar dates
You can also pick from the calendar below; every day shows its lunar date.
This only converts dates; it does not judge lucky or unlucky days. For dates by custom, ask the elders in your family.
Tết in the coming years
The 1st day of the 1st lunar month, worked out by this very tool. Tap one for the details.
Worked out on Vietnam time (GMT+7), so in some years Tết falls on a different date than in China (GMT+8): one day apart in 2007 and 2030, a whole month apart in 1985 (21/1 against 20/2).
Lunar calendar
Day 24, month 9
year Bính Ngọ · a full month of 30 days
Solar calendarMonday, 02/11/2026
- Day
- Canh Thìn
- Can Chi of the day
- Month
- Mậu Tuất
- Lunar month 9
- Year
- Bính Ngọ
- Lunar year 2026 · the Horse
- Solar term
- Sương Giáng
- From 23/10 · Lập Đông on 07/11
- Leap month
- None
- In lunar year 2026
- From today
- Today
- Monday
November 2026
Lunar: months 9–10, year Bính Ngọ
Today1st of a lunar monthLunar festivalL: leap month
Small tips
Write the wedding date so the whole family understands
Print both calendars on the invitation
Grandparents tend to remember the lunar date, friends the solar one. “Sunday, 06/12/2026 (day 27 of lunar month 10, year Bính Ngọ)” is clear to everyone.
Watch for years with a leap month
In a lunar year with a leap month, one month happens twice. When the elders pick a day, check whether they mean the ordinary month or the leap one.
Check the day of the week
Once converted, look at which weekday it falls on, and whether it clashes with a public holiday or with either family’s work, before you print the invitations.
How does the tool work out lunar dates?
With Hồ Ngọc Đức’s astronomical algorithm, which computes new moons and principal solar terms on Vietnam time, GMT+7, matching the lunar calendar used in Vietnam. Every calculation runs in your browser.
Why is Tết on a different day from China in some years?
The Vietnamese lunar calendar runs on GMT+7, the Chinese one on GMT+8. When a new moon falls between 11 pm and midnight, the two start the month a day apart, as with Tết in 2007 and 2030. Some years differ more: Tết 1985 was 21 January in Vietnam and 20 February in China.
What is a leap month, and how do I enter one?
Every two or three years the lunar calendar adds a month to stay in step with the seasons. It is called a leap month and carries the same number as the month before it. In the Lunar → Solar direction, choose the month and press “Leap month”; the button only works when that year has that leap month.
Does the tool pick lucky days or check compatibility?
No. It only converts dates and shows the Can Chi and solar term, like a wall calendar. For choosing a date by custom, ask the elders in your family.
What do full and short months mean?
A lunar month of 30 days is a full month; one of 29 days is a short month. If you choose the 30th of a short month, the tool tells you so you can pick again.
Which years can I convert?
From 1800 to 2199. Outside that range the maths still runs, but we have not checked it against printed calendars, so it is locked for now.
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- Refresh a shared linkPreview the link card on Zalo and Facebook, and how to refresh it when it still shows the old image.
- All toolsSee the full set of free wedding tools from Trọn Một Đời.
Trọn Một Đời
Date settled — time for the invitation
A Trọn Một Đời invitation shows both the solar and the lunar date, with a countdown, a map and a place for guests to reply.