Birthday in leap month, which one shall prevail?

Generally speaking, the birthday of leap month is based on all normal Gregorian calendar time or general lunar calendar date. For example, for a person born on April 2, 202 1 leap, the date is May 24. Therefore, birthdays in the future are celebrated on May 24th, which can prevent people born in leap months from having birthdays every few years or even decades.

It adds a month and a day to the lunar calendar, so that the average length of the calendar year is close to the tropic year.

It means that the lunar calendar increases by one month every leap year.

The ancients set up a leap month according to the twenty-four solar terms.