One lunar month and day, many Gregorian dates
What a lunar birthday means
A lunar birthday repeats on the same lunar month and day, rather than on the same Gregorian date. Because the two calendars follow different cycles, its Gregorian date moves from year to year.
Start with the birth date
Enter a Gregorian birth date to find its exact lunar month, day and any leap-month status.
Find the next occurrence
The calculator carries that lunar date into the current and upcoming lunar years.
Keep the leap-month detail
A leap month is a separate occurrence, so it can change whether a birthday has a matching date in a year.
Why a lunar birthday can be absent
A lunar month has 29 or 30 days. A person born on day 30 may not have a matching day 30 in a shorter month, and a leap-month birthday only recurs in years with that leap occurrence.
Why the Gregorian date moves
Lunar months begin at new moons. Leap months keep the lunar calendar aligned with the seasons, which is why a recurring lunar date shifts through the Gregorian calendar.