Lunar Calendar Converter
ConverterConvert between Gregorian and Chinese lunar dates, with zodiac, Gan-Zhi, solar terms and leap month support. Check traditional festivals birthdays with zodiac.
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About Lunar Calendar Converter
The Chinese lunar calendar is a lunisolar system: months follow the moon's phases while leap months and solar terms keep it aligned with the solar year, so the mapping between Gregorian and lunar dates shifts every year. This tool uses the lunar-javascript offline engine to convert bidirectionally - enter a solar date to get the lunar date, zodiac animal, year/month/day Gan-Zhi pillars, NaYin element, current and adjacent solar terms, weekday, constellation and traditional festivals; enter a lunar date (including leap months) to recover the Gregorian date.
How to Use
- Open the Lunar Calendar Converter tool
- Select the source and target formats
- Adjust the output options as needed
- Click the Convert button; results appear in real time
- Copy or export the result
Use Cases
- Almanac lookup — Check the lunar date, Gan-Zhi pillars and solar terms for any day to guide traditional event planning.
- Birthday conversion — Convert an elder's lunar birthday to a Gregorian date so you can set reliable yearly reminders.
- Festival planning — Work out the Gregorian dates of Spring Festival, Mid-Autumn and Dragon Boat ahead of time for holiday scheduling.
- BaZi pillars — Quickly retrieve the year, month and day Gan-Zhi pillars and NaYin element for astrology enthusiasts.
- Leap month check — Enter a lunar date with a leap month to verify whether it exists and recover the corresponding solar date.
FAQ
What's the difference between lunar and solar calendars?
The solar (Gregorian) calendar follows Earth's orbit around the sun (~365.24 days). The Chinese lunar calendar months follow moon phases (~29.53 days) and add leap months and solar terms to stay aligned with the solar year, so dates shift annually.
How do leap months work?
A lunar year is about 354 days - roughly 11 days short of a solar year. To avoid drift, a leap month (a repeat of an existing month) is added about every 2-3 years. This tool automatically lists leap months when they exist.
How is the Gan-Zhi year calculated?
Heavenly Stems and Earthly Branches combine into 60 pairs that cycle yearly. This tool uses LiChun (Start of Spring) as the year boundary, following traditional astrology convention.
Are solar terms fixed?
The 24 solar terms are defined by the sun's ecliptic longitude, so their Gregorian dates drift by 1-2 days each year. The tool shows whether the current day is a solar term and lists the nearest ones.