What year is leap month?

Leap month in Gregorian calendar is 29 days, leap month in lunar calendar is 30 days, and abortion is 29 days. Gregorian leap month refers to February 29th, which occurs every four years in Gregorian calendar, and is a leap month (leap February). Lunar leap month means that the lunar calendar has two February, the second February is leap February, the lunar leap month has 30 days, and the abortion month has 29 days. This is because the lunar calendar uses 1 month to circle the earth once (about 29.53059 days), and because it cannot be set to 0.53059 days, the big month is set to 30 days, and the small month is set to 29 days (about 29.53059 days).