What is a birthday? Can you believe it?

Birthday is our date of birth. . In ancient China, there were no popular Arabic numerals. People used the heavenly stems and earthly branches method to record time, working for twelve days, and working in twelve places. . Birthday means when you were born. . Just like birthdates, a famous player in the Tang Dynasty, was on the May Day, and now the time is1212 at noon. Our year 2009, converted into heavenly stems and earthly branches chronology, is an ugly year. . So, a birthday is a birthday. . . . But if two people get married, it's a birthday. . That is superstition. . Because marriage is consensual. Birthdays can't be together. . .