The Buddhist fasting calendar follows the lunar months: those who keep two days a month usually choose the new moon (the 1st) and the full moon (the 15th); those who keep the ten days of abstinence fast on the 1st, 8th, 14th, 15th, 18th, 23rd, 24th, 28th, 29th and 30th (a 29-day month has no 30th). Today, Sunday 1 November 2026, is the 23rd day of the ninth lunar month, Bính Ngọ year — a fast day; the next full moon is Monday 23 November 2026 and the next new moon Monday 9 November 2026. The full moon of the tenth month (Hạ Nguyên) of the Bính Ngọ year falls on Monday 23 November 2026.
A practice calendar by Inti Foundation · updated
The fast days left this month and the ten fast days of the lunar months after it, with their solar dates, by the Vietnamese lunar calendar (UTC+7). Full and new moons in bold.
The observances of the Inti Dharma calendar (Vietnamese Buddhist tradition; none is kept in an intercalary month) and the named full moons, over the next five months or so.
The solar dates of the new and full moon of every lunar month in 2027. The Lunar New Year (Tết) falls on Saturday 6 February 2027.
| Lunar month | New moon (1st) | Full moon (15th) | Days |
|---|---|---|---|
| 12th · Bính Ngọ | 8 Jan (Fri) | 22 Jan (Fri) | 29 |
| 1st · Đinh Mùi | 6 Feb (Sat) | 20 Feb (Sat) | 30 |
| 2nd · Đinh Mùi | 8 Mar (Mon) | 22 Mar (Mon) | 30 |
| 3rd · Đinh Mùi | 7 Apr (Wed) | 21 Apr (Wed) | 29 |
| 4th · Đinh Mùi | 6 May (Thu) | 20 May (Thu) | 30 |
| 5th · Đinh Mùi | 5 Jun (Sat) | 19 Jun (Sat) | 29 |
| 6th · Đinh Mùi | 4 Jul (Sun) | 18 Jul (Sun) | 29 |
| 7th · Đinh Mùi | 2 Aug (Mon) | 16 Aug (Mon) | 30 |
| 8th · Đinh Mùi | 1 Sep (Wed) | 15 Sep (Wed) | 29 |
| 9th · Đinh Mùi | 30 Sep (Thu) | 14 Oct (Thu) | 29 |
| 10th · Đinh Mùi | 29 Oct (Fri) | 12 Nov (Fri) | 30 |
| 11th · Đinh Mùi | 28 Nov (Sun) | 12 Dec (Sun) | 30 |
| 12th · Đinh Mùi | 28 Dec (Tue) | 11 Jan 2028 (Tue) | 29 |
The ten fast days of each lunar month are the 1st, 8th, 14th, 15th, 18th, 23rd, 24th, 28th, 29th and 30th. A 29-day month has no 30th, so it has nine, the 29th being a fast day already. Those who keep two days a month usually keep the new moon and the full moon.
The next full moon is the 15th day of the tenth lunar month, Bính Ngọ year, Monday 23 November 2026; the next new moon is the 1st day of the tenth lunar month, Bính Ngọ year, Monday 9 November 2026.
The full moon of the tenth month of the Bính Ngọ year, called Tết Hạ Nguyên in Vietnamese folk custom, is Monday 23 November 2026. For Buddhists it is a full-moon day, one of the month's fast days.
The first full moon of the Đinh Mùi year (Tết Nguyên Tiêu, also called Thượng Nguyên) is Saturday 20 February 2027; the Lunar New Year (Tết) of the Đinh Mùi year is Saturday 6 February 2027.
The eleventh lunar month of the Bính Ngọ year (a 30-day month): 1st – 9 Dec, 8th – 16 Dec, 14th – 22 Dec, 15th – 23 Dec, 18th – 26 Dec, 23rd – 31 Dec, 24th – 1 Jan 2027, 28th – 5 Jan 2027, 29th – 6 Jan 2027, 30th – 7 Jan 2027. The twelfth lunar month of the Bính Ngọ year (a 29-day month): 1st – 8 Jan, 8th – 15 Jan, 14th – 21 Jan, 15th – 22 Jan, 18th – 25 Jan, 23rd – 30 Jan, 24th – 31 Jan, 28th – 4 Feb, 29th – 5 Feb.
On this page: the table Fasting calendar 2027 gives the solar dates of the new and full moon of every lunar month in 2027, computed by Inti Dharma's lunar calendar. Tết that year falls on Saturday 6 February 2027.
They are observance days (uposatha): lay followers keep their precepts more fully, chant and meditate, and some take the eight precepts for a day and a night. The Numbered Discourses (AN 3.37) tie the eighth, the fourteenth and the fifteenth day of each half-month to keeping the uposatha, honouring one's parents and doing good.
By the Vietnamese lunar calendar at UTC+7, computed astronomically: a lunar day starts at midnight Vietnam time of the day of the new moon, the eleventh month is the one holding the winter solstice, and in a leap year the intercalary month is the first without a principal solar term. Observances are not kept in an intercalary month; one set on the 30th is kept on the 29th in a 29-day month.
