The correct birthday is lunar or solar

Lunar Calendar.

According to Chinese tradition, one should choose to celebrate the lunar calendar. But nowadays, children's birthdates are determined according to the Gregorian calendar, so it's okay to have a Gregorian birthday, but be aware that you can only choose one of the two, not both.

And it is still customary to use the lunar calendar for birthdays in general. So everyone can have two birthdays, one on the lunar calendar and one on the Gregorian calendar. Because the Chinese Lunar Calendar is a revised lunar calendar, which is related to the moon's rotation cycle, each year's Lunar Calendar birthday corresponds to a different date in the Gregorian calendar.

The reason why birthdays are celebrated according to the lunar calendar.

The Lunar Calendar is a traditional Chinese calendar, which has been passed down from generation to generation by the Chinese people, so Chinese people are used to celebrating birthdays according to the Lunar Calendar. The Lunar Calendar is a traditional Chinese calendar, also known as the Lunar Calendar, Chinese Calendar, Summer Calendar, Han Calendar, and Chinese Calendar. The lunar calendar takes the cycle of the phases of the moon, i.e., the lunar month, as the length of the month, adds the "24 Solar Terms" of the Stem and Branch Calendar, and refers to the solar return year as the length of the year, and sets up intercalary months in order to make the average calendar year compatible with the return year.

The solar calendar is different from the lunar calendar in that it is based on the Earth's orbit around the sun. The lunar calendar is a calendar based on the lunar calendar (the summer calendar) and incorporates elements of the solar calendar, so the Chinese lunar calendar should not be called the lunar calendar in the strict sense, but a combination of the lunar and solar calendars.