How the Chinese Calendar Works
The Chinese calendar has guided family life for thousands of years, and it’s still an important part of daily life for millions of people today.
While work, school, and travel usually follow the Gregorian calendar, many of life’s most meaningful occasions follow the traditional Chinese calendar. Chinese New Year, the Mid-Autumn Festival, Dragon Boat Festival, lunar birthdays, and family memorial days all use this older calendar system.
If you’ve ever wondered why these celebrations fall on different Gregorian dates each year, or why a grandparent celebrates a birthday on a different day than the one on their passport, the Chinese calendar explains why.
What is the Chinese calendar?
The traditional Chinese calendar is a lunisolar calendar. That means it follows both the moon and the sun. The months are based on the phases of the moon, while the overall year stays aligned with the seasons using the sun.
This combination has been used in China for centuries and is still used today to determine traditional festivals, cultural celebrations, religious observances, and many family events.
Although people often call it the “Chinese lunar calendar,” it’s more accurate to describe it as a lunisolar calendar because both the moon and the sun play an essential role.
Why do Chinese holidays change every year?
This is one of the most common questions people have. Unlike the Gregorian calendar, where holidays such as Christmas always fall on the same date, most Chinese festivals follow lunar dates.
Each lunar month begins with a new moon and lasts either 29 or 30 days. Because lunar months don’t fit perfectly into the 365-day solar year, the corresponding Gregorian dates change every year.
That’s why:
- Chinese New Year falls between late January and late February.
- The Mid-Autumn Festival moves to a different September or October date each year.
- Dragon Boat Festival also changes its Gregorian date every year.
The festival itself never changes. Only its Gregorian date does.
Why do some Chinese birthdays change every year?
Many families celebrate birthdays using the traditional Chinese calendar instead of the Gregorian calendar. A person’s lunar birthday always falls on the same lunar date, but that date corresponds to a different Gregorian day each year.
For example, someone born on the 15th day of the eighth lunar month will always celebrate on that lunar date, even though it may fall on a different day in September or October each year.
This is one reason many families keep track of both calendars.
How are Chinese months different?
Every month begins with a new moon. Instead of having a fixed number of days, each month contains either 29 or 30 days. There are normally twelve lunar months in a year, but occasionally an extra month is added to keep the calendar aligned with the seasons.
Because the months follow the moon rather than fixed Gregorian dates, they don’t begin on the same day each year. Many traditional celebrations are tied to these lunar months.
正月 Zhēngyuè (1st month)
Jan-Feb
Chinese New Year on day 1; Lantern Festival on day 15
二月 Èryuè (2nd month)
Feb-Mar
三月 Sānyuè (3rd month)
Mar-Apr
Qingming (a solar-term festival) falls nearby, April 4-6
四月 Sìyuè (4th month)
Apr-May
五月 Wǔyuè (5th month)
May-Jun
Dragon Boat Festival on day 5
六月 Liùyuè (6th month)
Jun-Jul
七月 Qīyuè (7th month)
Jul-Aug
Qixi on day 7
八月 Bāyuè (8th month)
Aug-Sep
Mid-Autumn Festival on day 15
九月 Jiǔyuè (9th month)
Sep-Oct
Double Ninth Festival on day 9
十月 Shíyuè (10th month)
Oct-Nov
冬月 Dōngyuè (11th month)
Nov-Dec
Contains the winter solstice (Dongzhi)
腊月 Làyuè (12th month)
Dec-Jan
New Year’s Eve reunion dinner on the last day
These dates stay the same within the Chinese calendar while moving on the Gregorian calendar each year.
What is a leap month?
about 354 days
twelve lunar months
roughly 11 days short of the solar year
13 months
383-385 days
a year with a leap month
every 2-3 years
闰月 rùnyuè
a full month repeats
A lunar year is about eleven days shorter than a solar year. If nothing changed, Chinese festivals would slowly move into different seasons.
To prevent this, the Chinese calendar occasionally adds an extra lunar month called a leap month (闰月). Unlike the Gregorian calendar, which adds a single leap day every four years, the Chinese calendar sometimes repeats an entire month. This happens roughly every two or three years, keeping spring festivals in spring and autumn festivals in autumn.
Most people never need to calculate leap months themselves, but they are an important reason the calendar stays accurate over time.
What are the 24 solar terms?
The Chinese calendar follows more than the moon. It also divides the year into 24 solar terms (节气) that mark seasonal changes. These seasonal markers were traditionally used to guide farming, planting, and harvesting.
Solar-term holiday
Qingming (清明)
Tomb-Sweeping Day follows the sun rather than the moon, so it falls around April 4-6 every year.
Together, the lunar months and solar terms keep the calendar connected to both the moon’s phases and the changing seasons.
How does the Chinese zodiac work?
The Chinese zodiac is based on the traditional calendar rather than January 1. Each year is represented by one of twelve animals:
Each zodiac year is also paired with one of the Five Elements:
Together they create a repeating 60-year cycle.
February 17, 2026
Fire Horse year (丙午 bǐngwǔ)
February 6, 2027
Fire Goat year (丁未 dīngwèi)
Because zodiac years begin on Chinese New Year, someone born in January or early February may belong to the previous zodiac year rather than the new one.
How do you read a Chinese calendar date?
Chinese dates are written using the lunar month followed by the day. For example:
八月
8th month
十五
15th day
八月十五 means the eighth lunar month, fifteenth day. This is the date of the Mid-Autumn Festival every year.
Although the lunar date stays the same, its Gregorian date changes because the lunar calendar follows the moon.
Chinese calendar vs. Gregorian calendar
The Chinese and Gregorian calendars serve different purposes. The Gregorian calendar is used for everyday life, including work, school, travel, and appointments. The Chinese calendar is still used for many traditional occasions, including festivals, lunar birthdays, ancestor memorial days, and religious observances.
For many families, both calendars are equally important. Seeing them together helps ensure that cultural traditions remain part of everyday life instead of being overlooked.
Keep both calendars together
If your family celebrates Chinese traditions, switching between calendar systems can become confusing. A birthday might be remembered according to the lunar calendar while school events, holidays from work, and travel plans all use the Gregorian calendar. Bringing both systems together makes planning simpler.
With CultureSync, you can create a printable calendar that combines the Chinese and Gregorian calendars in one monthly view. Include the festivals your family celebrates, add birthdays and personal events, and see every important date together without converting dates yourself.
Whether you’re planning for home, school, or your community, you’ll always know when your traditions and everyday life come together.
More guides
- How the Chinese Calendar Works
- Chinese Holidays 2026-2027
- Chinese School Calendar for Educators
- How the Christian Calendar Works
- Christian Holidays 2026-2027
- Calendars for Christian Educators
- How the Gregorian Calendar Works
- US Federal Holidays 2026-2027
- Canadian Statutory Holidays 2026-2027
- School-Year Calendar for Educators
- How the Hebrew Calendar Works
- Jewish Holidays 2026-2027
- Calendars for Jewish Educators
- Classroom Observances Calendar
- Printable Calendar Guide