①. Because the big and small months of the lunar calendar are not fixed, those born on the last day of the big month can only celebrate their birthdays one day earlier. Same as ③. If there is no thirty, the 29th is New Year's Eve and cannot be called "New Year's Eve"
②. If someone is born at noon on May 23, 2001 in the Gregorian calendar, that is, in the lunar calendar If it falls on the first day of April in the year of Xinsi, then the person's birthday will be on the first day of April in the following year. If a leap April occurs again a few years later, he will continue to celebrate his birthday in leap April.
④. There is indeed no "Jiazi Jiazi Jiazi Jiazi" you mentioned, because the month is determined according to the year. In the year of Jiazi, the month of Bingzi can only be arranged, and it cannot be any other month. .
The dates can be rotated, and the hours are arranged according to the dates. The sub-hour of the Jiazi day is actually the Jiazi hour.