Is the birthday in Feng Shui knowledge a lunar calendar or a solar calendar?

Officially, it is based on the new calendar, but due to the traditional thinking of China people, people born before 1990 generally write their dates of birth in the lunar calendar. Because there was no birth certificate at that time, they wrote it according to their parents' report when they registered their accounts. But now, the date of birth on the ID card is based on the new calendar, not the lunar calendar. Now, the date of birth of children is also based on the new calendar, regardless of the lunar calendar in formal work. Because the lunar calendar is only an algorithm of China people, which is not available abroad, the algorithm of the new calendar is universal.