Vietnamese lunar calendar today

Today, Thursday 05/11/2026, is day 27 of lunar month 9, year Bính Ngọ on the Vietnamese lunar calendar, a Quý Mùi day.

Month 11/2026

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Day-by-day lunar calendar index one page per day, with the Can Chi, auspicious hours and day officer.

Solar date: 5/11/2026

Lunar: 27/9/2026

Remind me on this day

Reminders need you to sign in; the lunar calendar, auspicious hours and holidays stay fully available without an account.

See the lunar date for today or any day, calculated on Vietnam time. Tap a day on the month grid to see its stem and branch, auspicious hours and holidays. Signed in, you can set reminders for death anniversaries and full-moon days.

Calendar and astronomyComputed and cross-checked.

Where this comes from

Ho Ngoc Duc's algorithm for the Vietnamese lunar calendar, using Jean Meeus's formulas for the new moon and the Sun's longitude, computed in Vietnam time (UTC+7). Lunar dates, stems and branches and solar terms are computed; the auspicious hours on the page are a date-selection convention.

Checked againstNASA: 2,474 new moons, 1901 to 2100; IMCCE: 4,824 solar-term instants, 1900 to 2100; USNO: 804 equinoxes and solstices, 1900 to 2100.

Solar date	05/11/2026
Lunar date	27/9/2026
Day (stem-branch)	Quý Mùi
Month (stem-branch)	Mậu Tuất
Year (stem-branch)	Bính Ngọ (Horse)
Auspicious hours	Dần (3h-5h), Mão (5h-7h), Tỵ (9h-11h), Thân (15h-17h), Tuất (19h-21h), Hợi (21h-23h)
Solar term	Frost Descent

How the lunar calendar works

Classical allusion

“Trăm năm còn có gì đâu, chẳng qua một nấm cỏ khâu xanh rì.”

Translation: A hundred years, and what remains? Nothing but a green, grass-grown mound.

Nguyễn Gia Thiều · Lament of a Palace Concubine

Auspicious hours

You have the lunar date. Auspicious hours shows which hours of the day are traditionally good for big undertakings.

Open Auspicious hours

Where calendars differ

Time zone of the calendar

Nhật Nguyệt usesEvery year is computed in UTC+7 (Hanoi time), including years when Vietnamese calendars were still printed in UTC+8; the site does not switch time zones by year or by region. As a result, between 1950 and 2050 the site's Tết differs from Chinese New Year (UTC+8) in 1965, 1968, 1969, 1985, 2007 and 2030.

The other wayVietnamese calendars followed Beijing time, UTC+8, until 8 August 1967 in the North and until 1975 in the South. By the calendar of the day, Tết 1965 fell on 2 February (the site gives 1 February); Tết 1968 was 29 January in the North and 30 January in the South; Tết 1969 in the South was 17 February (the site gives 16 February). For dates in the South before 1975, also check a UTC+8 calendar.

3 other conventions

Leap months

Nhật Nguyệt usesWhen 13 new moons fall between two months 11 (the month holding the winter solstice), the first month without a principal term is the leap month and takes the number of the month before it. Principal terms are judged in UTC+7. Checked against a calendar rebuilt by this same rule from NASA new-moon times and IMCCE principal terms: 2,459 of the 2,461 lunar months from 1901 to 2100 match, including all 73 leap months; in the other two, starting 9 December 2072 and 19 October 2085, the new moon falls within a minute of midnight and the site's day 1 is one day off. The Tử Vi chart places stars by month number and treats a leap month like the regular month of that number.

The other wayThe Chinese calendar applies the same rule in UTC+8, so a leap month or a day 1 can differ from the Vietnamese one: China had a leap month 10 in 1984 while Vietnam had a leap month 2 in 1985; in 2031 the leap month 3 starts a day earlier in Vietnam. Some Tử Vi schools split a leap month: days 1 to 15 count as the previous month, day 16 onward as the next.

How solar-term moments are computed

Nhật Nguyệt usesThe Sun's apparent longitude from Jean Meeus's short formula, with aberration, nutation and ΔT; each term's moment is found by bisection to within a minute, in Vietnam time. Against the INPOP ephemeris of IMCCE (Paris Observatory) for 4,824 moments from 1900 to 2100, and the US Naval Observatory for equinoxes and solstices: 3 minutes early on average, 14 minutes at most. Term dates match for 4,814 of the 4,824 moments; the 10 that differ all fall within 15 minutes of midnight.

The other wayObservatories use full ephemerides accurate to the second. Chinese calendars count in UTC+8, so a term beginning between 23:00 and 24:00 Vietnam time falls on the next date there.

When the day turns over

Nhật Nguyệt usesThe daily calendar page, the day's stem and branch, day officer, day god and auspicious hours follow the civil date, which turns at 00:00 Vietnam time. The Four Pillars chart alone turns the day pillar at 23:00, the start of the Tý hour, as in most Tử Bình texts: a birth from 23:00 takes the next day's stem and branch, with no split into early and late Tý. The Tử Vi chart takes the lunar date of exactly the Gregorian date entered, even when the Tý hour is chosen. So for a birth between 23:00 and midnight the two charts can rest on different days.

The other wayThe early and late Tý school keeps the old day's stem and branch from 23:00 to 24:00 and changes only the hour stem. Some calendars turn the day at 00:00 for the Four Pillars as well. Some Tử Vi texts treat a birth from 23:00 as a birth on the next day.

What no one has shown

This is a computation; no part of it is belief. Its limits are the error of the astronomical algorithm, measured and published in the model profile, and the points where calendars choose differently, such as time zone and the day boundary.

Read on

ArticleThe Vietnamese Lunar Calendar Is Actually a Lunisolar Calendar: Why the Shortened Name 'Lunar Calendar' Causes Misunderstanding ArticleThe Lunar Leap Month: Why It Exists, How It Is Calculated, and Why One Lunar Day in a Leap Year Corresponds to Two Solar Days ArticleWhy two calendars give different lunar dates for the same solar day, and where time zones come in GlossaryWhat is Tiết khí?

Ask Nhật Nguyệt AI

Why do some lunar years have a leap month?Why can two calendars show different lunar dates for the same day?

Learn more

How is the Vietnamese lunar calendar worked out?

The lunar calendar Vietnamese people use every day is really a lunisolar one. Months follow the Moon: day 1 is the day of the new moon, and the 15th is around the full moon. Years follow the Sun thanks to leap months, so Tết always falls at the end of winter or the start of spring.

A lunar month has 29 or 30 days. An ordinary year has 12 months, about 354 days; a leap year has 13, about 384 days. Seven years in every 19 are leap years. The leap month takes the number of the month before it: 2025 had a sixth month followed by a leap sixth month.

The site computes every year in Hanoi time (UTC+7). The Chinese calendar uses UTC+8, so when the new moon falls close to midnight the two calendars can differ by a day. Between 1950 and 2050, the site's Tết differs from Chinese New Year in 1965, 1968, 1969, 1985, 2007 and 2030.

Vietnam once printed its calendar on Beijing time: the North until August 1967, the South until 1975. The site does not switch time zones by year, so a few old dates can differ from the calendar printed at the time. For example, Tết 1965 is 1 February on the site, while that year's printed calendar gave 2 February.

Each day also carries a stem-branch pair, such as Canh Tuất or Giáp Tý, in a 60-day cycle. Ten heavenly stems and twelve earthly branches combine into 60 pairs that name days, months, years and hours. Auspicious hours, age matching and Tử Vi charts all rest on these pairs.

The 10 Heavenly Stems and 12 Earthly Branches
Group	Members
10 Heavenly Stems	Giáp, Ất, Bính, Đinh, Mậu, Kỷ, Canh, Tân, Nhâm, Quý
12 Earthly Branches	Tý, Sửu, Dần, Mão, Thìn, Tỵ, Ngọ, Mùi, Thân, Dậu, Tuất, Hợi
Can-Chi cycle	10 Stems × 12 Branches combine into 60 unique pairs before repeating (the sexagenary cycle)

Frequently asked questions

Is the lunar calendar here accurate?

Lunar dates are computed from the true positions of the Moon and the Sun on Vietnam time, and checked against NASA new-moon data and IMCCE (France) solar-term data. For recent years the results match Vietnamese block and wall calendars.

Why does the lunar calendar have leap years?

Because 12 lunar months are about 11 days shorter than a solar year. Without a correction Tết would drift into summer within a few decades, so a month is added whenever the gap builds up, 7 times in every 19 years.

Is the Vietnamese lunar calendar the same as the Chinese one?

The method is the same but the time zone differs: Vietnam uses UTC+7, China UTC+8. Most dates agree; only when the new moon falls near midnight do the two calendars differ by a day, and in some years Tết falls on different days.

Do dates before 1975 match the old printed calendars?

Mostly yes. Dates where Hanoi time and Beijing time give different answers can differ, because calendars then were printed on UTC+8 (the North until August 1967, the South until 1975) while the site always uses UTC+7. For old dates in the South, check a calendar printed at the time as well.

What are the sóc and vọng days?

Sóc is the 1st of the lunar month, the new moon day. Vọng is the 15th, around the full moon. Many families burn incense or visit a pagoda on these two days.

What is a day's stem and branch used for?

It is the day's name in the 60-day cycle. Auspicious hours, date selection and age matching all start from the stems and branches of the day and the year, which is why calendars always print them.

Public API, returns JSON, no sign-in: GET https://api.nhatnguyet.org/api/v1/calc/lunar-month?mm=1&yy=2027; GET https://api.nhatnguyet.org/api/v1/calc/lunar-convert?dd=1&mm=1&yy=2027&direction=solar2lunar