C库函数 - gmtime() C库函数 - difftime() C库函数 - localtime() C库函数 - gmtime() #include <stdio.h> #include <time.h> #define BST (+1) #define CCT (+8) int main () { time_t rawtime; struct tm *info; time(&rawtime); /* Get GMT time */ info = gmtime(&rawtime ); printf("Current world clock:\n"); printf("London : %2d:%02d\n", (info->tm_hour+BST)%24, info->tm_min); printf("China : %2d:%02d\n", (info->tm_hour+CCT)%24, info->tm_min); return(0); } C库函数 - difftime() C库函数 - localtime()