#include <time.h>

time_t tt = time(NULL);//这句返回的只是一个时间戳
tm* t= localtime(&tt);
printf("%d-%02d-%02d %02d:%02d:%02d\n", 
  t->tm_year + 1900,
  t->tm_mon + 1,
  t->tm_mday,
  t->tm_hour,
  t->tm_min,
  t->tm_sec);

#include <windows.h>

SYSTEMTIME st = {0};
GetLocalTime(&st);
printf("%d-%02d-%02d %02d:%02d:%02d\n", 
  st.wYear,
  st.wMonth,
  st.wDay,
  st.wHour,
  st.wMinute,
  st.wSecond);