获取当前时间戳

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

#include <stdio.h> #include <stdlib.h>   #define _POSIX_C_SOURCE 200112L // for setenv on gcc #include <stdlib.h> #include <stdio.h> #include <time.h>   int main(void) {           time_t t = time(NULL);     struct tm* tm = localtime(&t);          printf("Today is           %s", asctime(tm));     printf("(DST is %s)\n", tm->tm_isdst ? "in effect" : "not in effect");     tm->tm_mon -= 100;  // tm_mon is now outside its normal range     mktime(tm);       // tm_dst is not set to -1; today's DST status is used     printf("100 months ago was %s", asctime(tm));     printf("(DST was %s)\n", tm->tm_isdst ? "in effect" : "not in effect"); }