Chinese Calendar

To be sure that all is done at the appropriate time it has always been vital to know the accurate date in the year. Many activities are keyed to the calendar: when seeds must be planted; grain harvested; fruit gathered and sheep moved to upland. So from the earliest times it has been essential to correctly track the passage of the year.

The Sun

Wild goose pagoda, Xian, Shaanxi, pagoda
Sunset at the Giant Wild Goose Pagoda, Xi'an
Sun or tài yang
sun motif

The earth goes around the sun once every 365.2425 days. This number is rather inconvenient as it is not readily divided up into whole units, not even a whole number of days. To work out the day within the year you can measure the angle of the sun at midday, but this assumes you have an accurate idea of time. It is at its highest at the Summer Solstice (21st June) or lowest Winter Solstice (21st December) [I am assuming Northern hemisphere]. If you have a clock you can measure when the length of a day is equal to the length of a night, and so identify the Spring and Autumn Equinoxes . The earliest astronomical instrument is just a stick in the ground - a gnomon to measure the sun's shadow - from which the sundial is a direct descendent.

To keep the solar calendar in synchronization with the earth’s orbit in the Julian Calendar an extra leap day needs to be inserted into the calendar every four years (4 x 0.25 = 1). However, the number of days is actually a little less than 365.25 it is closer to 365.2425, to account for this discrepancy the Gregorian calendar was devised with additional rules for leap days in century years (1900 was not but 2000 was a leap year). By the time the Gregorian system was introduced in 1582, the old Julian calculation had drifted from the true solar time by ten days or more. The Orthodox Eastern Church has still not accepted the Gregorian system and that is why they celebrate Easter on a different date.

The Stars

mansions, xiu
The twenty-eight mansions of the Chinese astronomy. May 2008. Image by Mysid available under a Creative Commons License

Perhaps more useful than using the sun as a clock is to take a look up at the stars. [For more on Chinese constellations please visit: Chinese stars and constellations]. The sun appears to move relative to the backdrop of stars through the year - and so the constellation the sun is currently in tells you the approximate date. As the sun is so bright, the observation has to be made just before sunrise or after sunset. The Chinese used the pole star and circumpolar stars rather than the sun as these are easier to observe accurately. Alternatively as summer progresses different stars and constellations appear above the southern horizon , and this is another way of roughly working out the date.

The Moon

Moon yuè or tài yīn

The moon has been the most useful clock for thousands of years. The moon takes 29.53 days to go around the earth and just as importantly the phase of the moon changes through this period from full to half to new to half and back to full again. By carefully tracking the phase of the moon you can work out the day within a month. It is best to work with the new moon as the starting day of the month, as it is easy to see when the disc is entirely dark without even a slither of light at its edge. People can then easily count through the days within the month up to 29, so as long as it is agreed when is the day of the new moon, you can agree dates and make arrangements for particular future days.

Shandong, Taishan, mountains, moon gate
View of Mount Taishan, Shandong. Note the prominent round Moon Gate.
Dragons chasing a ball representing the moon.

The word ‘calendar’ comes from the Latin kalendae ‘to announce’ referring to the Roman custom of announcing the official new moon that started the month. Everyone could then start counting the days within the new month.

Most regrettably the date calculated by the sun is out of step to that by the moon. There are 12.37 lunar orbits in a year and coping with this awkward number was a real problem for ancient world civilizations. If this was a whole number then calendars would be far simpler. It is probably that the unluckiness of thirteen has its origin in that the thirteenth month of the solar year is an awkward incomplete month.

One coincidence is that 19 x 12.37 is very close to the whole number of 235 and so the lunar and solar cycles roughly repeat each other every 19 years - this is the Metonic cycle named after the Greek mathematician Meton , who discovered it in 432BCE.

Chinese Calendars

Chinese calendar month

China has adopted the Western, Gregorian system of oddly formed months with extra leap days at the end of February to correct for the true length of solar year. This was introduced into China when it became a Republic in 1912. New public holidays such as Labor Day (May 1st) and National Day (October 1st) are fixed on the Gregorian calendar.

For a guide to reading and writing Chinese dates and times please see our Date and Time guide.

For a comprehensive Chinese Calendar for the current month and future years please see our Calendar section.

China developed its traditional calendar system independently from the West. China has two calendars which are still followed today, one based on the moon and one on the sun.

The lunar Chinese calendar is the most important as it determines the dates of most Chinese traditional festivals. Instead of adding in an extra leap day every four years the calendar introduces a whole leap month every couple of years. This calendar follows the moon precisely so months are either 29 or 30 days long according to accurate predictions of the occurrence of the new moon at a specific place. The months are called xiǎo yuè small months (29) and dà yuè big months (30) and are numbered rather than named.

This may seem a little complicated until you bear in mind that some Christian festivals such as Easter are still synchronized to the moon and not the sun. Christians had to develop similarly complex calculations to work out the date for Easter each year.

dragon dance


The start of the Chinese lunar year nián is at the Spring Festival or Chinese New Year, timed as the second new moon after the Winter Solstice. The Chinese originally split the year into two seasons Spring chūnand Autumn qiū (hence the name 'Spring and Autumn period'). These were split to form the four modern seasons by adding Summer xià and Winter dōng . The lunar months were named within the season so mèng chūn was the first month of Spring; zhōng chūn the second month and jì chūn the last month of Spring.

Intercalary months

The position in the year that the Chinese leap (intercalary) month is added varies from year to year, following the Metonic cycle . In 2012 it was added after the fourth month and in 2014 after the ninth month. The month is called after the normal month it follows with the addition of ‘leap’ rùn month. So the sequence in 2012 was sì yuè followed by sì rùn yuè. A year with a leap or double 8th month is considered an unlucky year (1976, 1995, 2014 and 2033). The addition of the extra month gives a length of year that varies between 353 to 385 days.

The creation of the lunar calendar is attributed to the Yellow Emperor back in the mists of ancient China. Very accurate astronomical measurements need to be taken to keep the lunar calendar in step with the sun. For many centuries the Purple Mountain Astronomical Institute at Nanjing calculated the calendar for China.


There is no astronomical basis for a seven day division of the year, unless perhaps, as roughly one quarter phase of the moon. The Chinese originally had a ten day week xún as this divides a month nearly precisely into three (four seven day weeks gives28 days while three ten day weeks gives30 days while the accurate month length is 29.53 days). At this time the days of the week were named after the Ten Heavenly Stems (tian gan)

Lunar dates

You will see some extra characters on Chinese calendars (including our own free calendar) : The day of the lunar month in the range 1 to 9 uses the character prefix chū for ‘early’. Instead of using three characters for 21 to 29 ( èr shí yī etc.) a special character for ‘twenty’ 廿 niàn is used. Similarly the number 31 is sometimes represented by ‘thirty’ . This convention gives all days a convenient two character form.

Lunar names

The months 2 to 10 are now numbered as you would expect but there is the special case of the first month which is called ( zhēng). To keep to the same two character format as with days, the 11th month is sometimes called dōng (cold) and the 12th month is (an alternative meaning is dried meat reflecting the lack of fresh meat in January).

Although lunar months are normally numbered they also have traditional poetic names.

1 zhèng yuè First month
2 xìng yuè Apricot month or huā Flower month
3 táo yuè Peach month
4 méi yuè Plum month
5 liú yuè Pomegranate month
6 hé yuè Lotus month
7 lán yuè Orchid month or guā Melon month
8 guì yuè Cinnamon or cassia month
9 jú yuè Chrysanthemum month
10 liáng yuè Fine month
11 dōng yuè Winter month
12 là yuè Preserved meat month
To see a Chinese Calendar for a month please see our Calendar section.
Jilin, autumn
Autumn in Jilin

The Lichun solar calendar

If you are a farmer it is the sun not the moon that determines when seed needs to be planted, corn harvested, lambs are due to be born. The Chinese Lunar calendar may be out by over ten days compared to the sun, and this length of time in a short growing season is important. So the alternative ‘agricultural’ or suì calendar is based on the sun. It has its origin in farming and it is still noted in Chinese calendars and almanacs. Two important traditional festivals are fixed according to the sui calendar: the Qing Ming festival and the Dongzhi (Mid Winter) festival.

The sui calendar uses 24 intervals of 15 or 16 days and, because they are based on the sun, fall on approximately the same Gregorian calendar date each year (plus or minus a day). These are called jié qì and date back to the Zhou dynasty, The table below gives the jieqi name and the days according to the Gregorian calendar, if one day is more likely than another that day is given first.

Xiao han: Moderate Cold
5th or 6th January
Da han: Severe Cold
20th or 21st January
Li chun: Spring Commences
4th or 3rd February
Yu shui: Spring Showers
19th or 18th February
Jing zhe: Insects Waken
5th or 6th March
Chun fen: Spring Equinox
20th or 21st March
Qing ming: Bright & Clear
4th or 5th April
Gu yu: Grain Rain
20th or 19th April
Li xia: Summer Commences
5th or 6th May
Xiao man: Grain forms
21st or 20th May
Mang zhong: Grain in Ear
5th or 6rd June
Xia zhi: Summer Solstice
21st or 22nd June
Xiao shu: Moderate Heat
7th July
Da shu: Great Heat
23rd or 22nd July
Li qiu: Autumn Commences
7th or 8th August
Chu shu: End of Heat
23rd August
Bai lu: White Dew
7th or 8th September
Qiu fen: Autumn Equinox
23rd or 22nd September
Han lu: Cold Dew
8th or 9th October
霜降 Shuāngjiàng
Shuang jiang: Frost
23rd or 24th October
Li dong: Winter Commences
7th or 8th November
Xiao xue: Light Snow
22nd or 23rd November
Da xue: Heavy Snow
7th December
Dong zhi Festival: Winter Solstice
22nd or 21st December

To master both solar and lunar calendars, Almanacs were widely published with guides to the best days of the year for doing all sorts of things, from felling trees to drying clothes and getting married.


Years are now counted just like ordinary numbers; the year of the Common Era. In Imperial China years were specified as the number of years of Emperor’s reign or from Yellow Emperor Huangdi's birth. This scheme was also used in Europe in medieval times. By tradition a life span was at most 60 years, and so a special sexagesimal year numbering system was also used for the Chinese astrological year. There is some evidence that in ancient days people who reached the age of sixty were buried alive in northern China as it was considered unnatural to live longer than that. The first years of the new cycle were considered the appropriate time to launch a revolution. Emperor Qianlong abdicated his rule after sixty years of reign in 1794 as he stated in his abdication proclamation that his cycle of rule had ended.

The sixty year cycle, used since the Han dynasty, is made up of the Ten Heavenly Stems ( tiān gàn) combined with Twelve Earthly Branches ( zhī) that are also used for the astrological years.

The 12 year cycle of branches has its origin as far back as the Shang dynasty in the orbit of the planet of Jupiter. Early observations had shown Jupiter takes about 12 years to orbit the sun (11.86 is the actual figure), and the twelve branches was used to denote the years in the cycle. The earthly branches also denote a direction (see our astrology page) so compasses had 12 divisions not 4 or 8 as in early Western systems.

In ancient times the Chinese split the year into six 60 day periods (double months) to make a 360 day year and so the historic importance of cycles of 60 can be clearly seen. It is interesting that the Mesopotamians used units of sixty for everything, from which we have ended up with 60 minute hours and 60 second minutes. There is a traditional epoch of 60x60x60x16x7 years making up 24,192,000 years.

The Ten Heavenly Stems shítiāngān


The heavenly stems are associated with a number, an element and a particular associations. Their principle use as 'ordinals' from ancient time so the third day or the third years would both use the ordinal stem character bǐng. A week in Shang dynasty times (as recorded on oracle bones) was ten days long. Some legal documents today still use these characters for numbering.

9rénWaterSea water
10guǐWaterFresh water

Sexagesimal Year Names gānzhī

They are incremented in step to form a cycle of 60 so that:

1 : 1st stem and 1st branch is followed by 2: 2nd stem and 2nd branch then 3: 3rd stem and branch and so on up to 10: having run out of stems for 11 the stems start again at one but the stems continue at 11: ; 12: , now at 13 the cycle of branches starts again 13:. The sequence does not repeat until 60 : guǐhài. It may seem a cumbersome system, but it is less prone to misreading or mishearing as two characters together provide the number not just one. To record a year these two characters were combined with the Emperor's reign name. Here is the complete table of the 60 year names of the Sexagesimal Cycle.

1 jiǎ zǐ13 bǐng zǐ25 wù zǐ37 gēng zǐ 49 rén zǐ
2 yǐ chǒu14 dīng chǒu26 jǐ chǒu38 xīn chǒu 50 guǐ chǒu
3 bǐng yín15 戊寅 wù yín27 庚寅 gēng yín39 壬寅 rén yín 51 jiǎ yín
4 dīng mǎo16 jǐ mǎo28 xīn mǎo40 癸卯 guǐ mǎo 52 乙卯 yǐ mǎo
5 戊辰 wù chén17 庚辰 gēng chén29 壬辰 rén chén41 jiǎ chén 53 bǐng chén
6 jǐ sì18 xīn sì30 guǐ sì42 yǐ sì 54 dīng sì
7 gēng wǔ19 rén wǔ31 jiǎ wǔ43 bǐng wǔ 55 wù wǔ
8 xīn wèi20 guǐ wèi32 yǐ wèi44 dīng wèi 56 jǐ wèi
9 rén shēn21 jiǎ shēn33 bǐng shēn45 wù shēn 57 gēng shēn
10 guǐ yǒu22 yǐ yǒu34 dīng yǒu46 jǐ yǒu 58 xīn yǒu
11 jiǎ xū23 bǐng xū35 戊戌 wù xū47 庚戌 gēng xū 59 壬戌 rén xū
12 yǐ hài24 dīng hài36 jǐ hài48 xīn hài 60 guǐ hài

At the turn of the 20th century the Republican movement wanted to create a Chinese year number based on the presumed birth of the Yellow Emperor Huangdi. This is a 'lunar' year so the year number advances on the day of the Chinese New Year (Spring) festival. So January 31st 2014 was the start of Chinese year 4712. Sometimes the sexagesimal year is noted relative to this base year so 2015 is the 32nd year of the 78th cycle since Huangdi. To find the Chinese year add 2698 to the Christian year, but take one off if the date precedes the Chinese New Year (Spring Festival).

For a full year's view please see 2016 calendar.

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