📅 Lunar Calendar Converter

About the Chinese Lunar Calendar

The Chinese calendar is a lunisolar calendar — it combines both lunar phases and solar position to track time. Unlike the purely solar Gregorian calendar, Chinese months begin on the new moon, and years begin on the second (or third) new moon after the winter solstice.

The 24 Solar Terms

The year is divided into 24 solar terms (节气, Jie Qi) that guide agricultural activities:

• Spring: Beginning of Spring, Rain Water, Awakening of Insects, Spring Equinox, Clear and Bright, Grain Rain
• Summer: Beginning of Summer, Grain Full, Grain in Ear, Summer Solstice, Minor Heat, Major Heat
• Autumn: Beginning of Autumn, Limit of Heat, White Dew, Autumn Equinox, Cold Dew, Frost Descent
• Winter: Beginning of Winter, Minor Snow, Major Snow, Winter Solstice, Minor Cold, Major Cold

Note: This converter provides an approximate lunar date. For exact conversions, specialized astronomical calculations are required. Chinese New Year falls between January 21 and February 20.

Why a Lunisolar Calendar?

Most of the world follows the Gregorian calendar, a purely solar system. China traditionally used a lunisolar calendar that tracks both the moon's phases and the sun's position. Months start on the day of the new moon, so each month is either 29 or 30 days. To keep the calendar aligned with the seasons, an extra leap month is inserted about every three years, which is why Chinese New Year jumps between late January and mid-February instead of sitting on a fixed date like January 1.

The 24 Solar Terms in Daily Life

The solar part of the calendar is expressed through the 24 Solar Terms (节气), a quarterly guide refined over two thousand years to direct farming, eating, and festival timing. They mark moments like the Beginning of Spring, the Spring Equinox, Grain in Ear (when rice is planted), the Summer Solstice, and the Winter Solstice. Farmers once planned sowing and harvest around them, and many families still eat seasonal foods tied to each term — for example, dumplings at the Winter Solstice. UNESCO recognized the system as Intangible Cultural Heritage in 2016.

How Festivals Are Set by the Moon

Because months begin at the new moon, the full moon always falls on the fifteenth day. That is why the Mid-Autumn Festival is celebrated on the fifteenth of the eighth lunar month, under the brightest moon of the year, and why the Lantern Festival lights up on the first full moon after Spring Festival. The lunar calendar therefore does more than count days: it decides when families reunite, when ancestors are honored, and when the new year is welcomed with red lanterns and fireworks.

Converting Dates and Finding Your Lunar Birthday

To find a lunar equivalent for any Gregorian date, you must account for the shifting new moons and the occasional leap month — work best done with an astronomical table or a tool like the converter above. Many people look up their lunar birthday to choose auspicious dates for weddings, moving house, or starting a business, since certain lunar days are traditionally favored. The converter gives an approximate lunar date and the nearest solar term so you can see where any day sits in the traditional year.

A Year Guided by the Moon

Living by a lunisolar calendar means the year breathes with the moon. Each month opens in darkness and swells to a full moon on the fifteenth, a rhythm that still structures holidays, family visits, and quiet evenings of moon-gazing. City dwellers may not farm by the solar terms anymore, yet they still eat the right food on the right day and travel home for the new year. The calendar is less a timepiece than a cultural heartbeat that connects modern life to two thousand years of seasonal wisdom.

Lunar Dates in Modern Life

You do not have to be a farmer to use the lunar calendar. People check it to pick wedding dates, house-moving days, and the best moment to launch a business, trusting certain lunar days as traditionally fortunate. Ancestor ceremonies, temple fairs, and regional festivals still follow it, and apps now convert dates instantly. The converter above is a quick way to see where any Gregorian day sits in that older system — a small bridge between the calendar on your phone and the one your grandparents kept.

The Moon in Chinese Poetry and Longing

No symbol captures the lunar calendar's emotional side better than the moon. For centuries poets wrote of gazing at the same moon while far from home, and the Mid-Autumn Festival turns that longing into a reunion under the fullest, brightest moon of the year. Eating mooncakes and watching the sky becomes a way to feel close to distant family. The calendar, in other words, is not only practical — it carries a whole literature of love, absence, and homecoming.

Leap Months and the 19-Year Cycle

To keep lunar months lined up with the solar year, the traditional calendar inserts a leap month about every three years, following a 19-year pattern in which twelve normal years and seven leap years balance the seasons. This is why the same lunar date can fall in different Gregorian months from year to year, and why festival dates drift within a range. The converter above handles the approximation for you, but knowing the leap-month rule explains why the Chinese calendar never feels quite fixed to the eye.

How to Read a Lunar Date String

A traditional lunar date is written as, for example, the eighth month, fifteenth day — which is why Mid-Autumn is easy to spot on the calendar. Years are named with the sexagenary cycle, so you may see a year labeled by its animal and element rather than a plain number. Once you know the pattern, old inscriptions, tombstones, and festival posters become readable at a glance. The converter above translates any modern date into this older notation, which is handy when you encounter a lunar birthday or an ancestor tablet written the traditional way.