The Chinese calendar is not one calendar. It is three clocks running together: the lunar months that set the festivals, the 24 solar terms that track the sun, and an unbroken cycle of sixty pillars that names every day. Most confusion about Chinese dates comes from mixing these clocks up, so this page separates them and then shows them working on two real days.
For Ba Zi (八字 bāzì) the distinction is not academic. A chart is built on two of the three clocks and ignores the third, and knowing which is which settles most “which year am I?” questions before they start.
The three clocks of the Chinese calendar
1. The lunar months (农历 nónglì)
The traditional calendar is lunisolar. Each month starts on the new moon, so a month runs 29 or 30 days, and a year holds 12 or 13 months. When a thirteenth is needed, a leap month (闰月 rùnyuè) is inserted, and the rule is precise: the month that contains no major solar term becomes the leap month. Neither 2026 nor 2027 has one. Month start dates, lengths and the leap-month logic are laid out in full on the Chinese lunar calendar page.
2. The 24 solar terms (二十四节气 èrshísì jiéqì)
The solar terms follow the sun, not the moon. There are 24 of them: 12 节 (jié), which open the solar months, and 12 中气 (zhōngqì), which sit in the middle of each month. Because they are tied to the sun’s position, they land on nearly the same Gregorian dates every year. The full list with 2027 times is on the 24 solar terms page.
3. The sixty-day cycle (干支纪日 gānzhī jìrì)
Every day carries a pillar: one Heavenly Stem over one Earthly Branch, paired in a cycle of sixty. That count has run unbroken for well over two thousand years, so each day’s pillar is fixed and does not depend on the moon or on where a month begins. If the stems and branches are new to you, start with the stems and branches primer.
Which clock does what
Festivals live on the lunar clock. Spring Festival (春节 chūnjié) is the first day of the first lunar month; Mid-Autumn is the fifteenth of the eighth. Ask “when is the festival” and the answer is lunar.
Ba Zi lives on the other two. The year and month pillars change at the solar terms, and only at the 12 jié. The year turns at Li Chun (立春 lìchūn, Start of Spring), not at Chinese New Year. The day and hour pillars come straight from the sixty cycle. The lunar month plays no part in a chart.
The classic mistake is to take a birth year from the lunar New Year. For anyone born between Li Chun and the festival, that gives the wrong year pillar, and every interaction that hangs off the year branch follows it into error.
One date, three readings: 6 February 2027
Take Chinese New Year 2027, which falls on Saturday 2027-02-06. Read it on each clock and the system comes into focus.
| Clock | Reading for 2027-02-06 | Why |
|---|---|---|
| Lunar months | 丁未年 正月初一 (first day of the first month) | Lunar month 1 of 2027 starts on this new moon |
| Solar terms | Month 壬寅 (Rén Yín), year 丁未 (Dīng Wèi) | Li Chun already passed on 2027-02-04 at 09:45 |
| Sixty-day cycle | Day 丙辰 (Bǐng Chén, Yang Fire over Earth Dragon) | Fixed by the unbroken count of days |
Now step back two days. On 2027-02-04 the lunar calendar still reads 丙午年 腊月廿八, the 28th of the twelfth month of the Horse year. Yet from 09:45 that morning Ba Zi has already moved to the 丁未 year and the 壬寅 month. For those two days the clocks disagree about the year, which is exactly the window covered on the Chinese New Year 2027 page. The Goat year itself is profiled under the 2027 Chinese zodiac, and the day pillar has its own write-up as the 丙辰 day pillar.
The same check for 12 October 2026
An ordinary day works the same way. On Monday 2026-10-12:
- Lunar: 丙午年 九月初三, the third day of the ninth lunar month. That month began on its new moon, 2026-10-10.
- Solar: year 丙午 (Bǐng Wǔ), counted from Li Chun on 2026-02-04 at 04:01, and month 戊戌 (Wù Xū), the Dog month that opens at Cold Dew (寒露 hánlù).
- Sixty cycle: day 己未 (Jǐ Wèi, Yin Earth over Earth Goat), described on the 己未 day pillar page.
Notice that the lunar year 2026 only began on 2026-02-17, thirteen days after Li Chun. Here the year labels agree, but the months do not: the ninth lunar month and the Dog solar month overlap without sharing a start date. A Ba Zi chart for that day uses 戊戌 and 己未, never “ninth month”.
Where the almanac sits on top
The almanac book, known in Singapore as 通胜 (tōngshèng), is built on these clocks. One of its layers, the twelve day officers, is computed purely from the day branch and the solar month branch, which is why it belongs to the solar side of the system. How the book is organised, and which of its layers this site computes, is covered on the Tong Shu page.
From there the cluster splits by task:
- To read the current day’s pillar, officer and clash animal, go to Chinese calendar today.
- To understand how a date is chosen for a wedding, a move or an opening, read auspicious dates. Selection starts with the generic day and ends with your own chart.
- For the year ahead month by month, the Ba Zi calendar 2027 lists each month pillar and when it begins.
Using the Chinese calendar with your own chart
Once the three clocks are separate in your mind, Chinese dates stop being contradictory. A festival date answers a cultural question. A solar-term date answers a chart question. A day pillar answers both, because the sixty cycle never resets.
To see the day pillar, the officer and the clash animal for today and the week ahead, open the almanac tool. To see how those days meet your own pillars, plot your birth data with the free Ba Zi calculator: find where the Chinese calendar places your year, month and day, and read the chart from there.