Everything About Lunar-Solar Conversion
Lunar dates still matter in Korean life — parents' birthdays kept by the lunar calendar, ancestral rites (jesa), and traditional holidays all follow it. Because a lunar date falls on a different solar day each year, families check the conversion annually. This tool converts both directions and instantly shows the solar dates of a lunar birthday for this year and next year.
The Korean lunar calendar includes leap (intercalary) months. Twelve lunar months add up to about 354 days, roughly 11 days short of the solar year, so an extra month is inserted every two to three years. In 2025, for example, there was a leap 6th month. When converting a date that falls in a leap month, the leap-month flag must be set to get the correct result.
Conversion results also show the sexagenary cycle (Gapja) names. The 60-year cycle combines ten heavenly stems and twelve earthly branches; 2026 is Byeong-o (丙午), the Year of the Horse. Year, month, and day pillars are all displayed in both Korean and Chinese characters — useful for Saju (Four Pillars) and zodiac lookups.
A table of major lunar holidays is included: in 2026, Seollal (lunar Jan 1) falls on February 17 and Chuseok (lunar Aug 15) on September 25, along with Jeongwol Daeboreum, Buddha's Birthday, Dano, and Chilseok. All calculations run instantly in your browser using Korea Astronomy and Space Science Institute data, covering the years 1000–2050.