strptime函数将字符串转换为时间格式代码

Sure, the strptime function in C is used to convert a string to a time format. The syntax for the function is:

#include <time.h>

char *strptime(const char *s, const char *format, struct tm *tm);

Here, `s` is the string you want to convert, `format` is the format of that string, and `tm` is the structure that will hold the converted time. The function returns a pointer to the end of the converted string, or NULL if the conversion failed.

An example usage of this function would be:

#include <stdio.h>
#include <time.h>

int main()
{
    char dateString[] = "2022-01-01 12:00:00";
    char formatString[] = "%Y-%m-%d %H:%M:%S";
    
    struct tm timeStruct;
    strptime(dateString, formatString, &timeStruct);
    
    printf("Year: %d\n", timeStruct.tm_year + 1900); // tm_year starts from 1900
    printf("Month: %d\n", timeStruct.tm_mon + 1); // tm_mon starts from 0
    printf("Day: %d\n", timeStruct.tm_mday);
    printf("Hour: %d\n", timeStruct.tm_hour);
    printf("Minute: %d\n", timeStruct.tm_min);
    printf("Second: %d\n", timeStruct.tm_sec);
    
    return 0;
}