The birth certificate says that Gregorian calendar 1990 was born at 00:25 on August 14, and my mother said it was the year of daylight saving time, so the birth certificate says.

From 1986 to 199 1, Chinese mainland implements daylight saving time. The specific way is: every year at 2 am on the first Sunday in mid-April (Beijing time), advance the time to 3 am (Beijing daylight saving time), and at 2 am on the first Sunday in mid-September (Beijing daylight saving time), and then adjust the time to 1 am (Beijing time) one hour later. 1986 The starting point of daylight saving time is May 4th. After 1992, China suspended the implementation of daylight saving time.

According to the date of birth (month), it is daylight saving time if it is between the first Sunday in mid-April and the first Sunday in mid-September, and normal time if it is not during this period.