The standard library STM32 real time clock function to realize the first is the BSP driver, including the initialization function (RTC_Init) and set the time function RTC_Set (). The next is the correlation function in the <time.h>, I just realized I think the most important function of the Time_t time (time_t*time) Time_t mktime (struct TM*timeptr) Struct TM*gmtime (const time_t*timer) And the auxiliary function Static int getTotalDays (int year, int month, int day) Because the gmtime function need to use malloc function in <stdlib.h>, sometimes do not want to use this function, so I also realized a his variant function UINT8 gmtime2 (struct TM*time, const time_t*timer)

rtc_time.c

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