Korean Lunar Calendar Converter
Last updated: 2026-06-25
Lunar date conversion turns a solar (Gregorian) date into a lunar date, or a lunar date into a solar date — often used to check birthdays, memorial days, and ancestral rites.
This converter uses a lookup table (2024-2035) based on Korea Astronomy and Space Science Institute lunisolar data. Example: solar 2026-02-17 = the 1st day of the 1st lunar month (Seollal).
Enter a Date
Conversion result
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Lunar conversion supports only 2024-2035 (solar 2024-02-10 to just before Seollal 2036). It uses a lookup table based on Korea Astronomy and Space Science Institute lunisolar data. (For reference)
How to Use
- Choose a direction — Pick Solar to Lunar or Lunar to Solar.
- Enter the date — Enter the year, month, and day. For Lunar to Solar, also indicate the leap month.
- Read the result — Click [Convert] to see the converted date and the sexagenary year (zodiac animal).
Lunar vs. Solar Calendars, and the Leap Month
The solar calendar takes the roughly 365.25 days it takes Earth to orbit the Sun as one year. The lunar (lunisolar) calendar, by contrast, uses the cycle of the Moon's phases (about 29.5 days) as one month, so 12 months total about 354 days. When this gap of about 11 days accumulates and drifts out of step with the seasons, the same month is inserted again roughly every 2-3 years to correct it — this is the leap month.
| Type | Basis | Year length | Leap |
|---|---|---|---|
| Solar | Sun (Earth's orbit) | ~365 days | Leap day (Feb 29) |
| Lunar | Moon (synodic month) | ~354 days | Leap month (repeated month) |
Holidays such as Seollal, Chuseok, and Buddha's Birthday, along with many families' ancestral rites and memorial days, are set by the lunar calendar, so their solar dates shift each year. With the lunar converter you can quickly find the solar date of a lunar birthday or memorial day. You can also check yearly holiday dates with the public holidays calculator.
Frequently Asked Questions (FAQ)
What is a leap month?
The lunar calendar is based on the Moon's cycle (about 29.5 days), so a lunar year of about 354 days is roughly 11 days shorter than a solar year. To close this gap, the same month is repeated once roughly every 2-3 years, and that extra month is called a leap month. For example, a leap 6th month is a second 6th month that follows the regular 6th month.
What years does the lunar conversion support?
This converter uses a 2024-2035 lookup table based on Korea Astronomy and Space Science Institute (KASI) lunisolar data. Solar dates in this range can be converted from February 10, 2024 up to just before Seollal 2036.
How do I find the solar date of a lunar birthday each year?
A lunar birthday falls on a different solar date each year. Choose Lunar to Solar, then enter the year and your lunar birthday (month and day) to see that year's solar date. If your birthday is in a leap month, indicate the leap month as well.
Are the conversion results accurate?
The lunar conversion uses a lookup table based on KASI lunisolar data, so it is accurate within the supported years (2024-2035). As a check, February 17, 2026 is the 1st day of the 1st lunar month of 2026 (Seollal), and January 29, 2025 is also the 1st day of the 1st lunar month.
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Last updated: 2026-06-25