gettimeofday是Linux上的函数,使用方法如下

#include <sys/time.h>
const char* srs_human_format_time()
{
    struct timeval tv;
    static char buf[23];

    memset(buf, 0, sizeof(buf));

    // clock time
    if (gettimeofday(&tv, NULL) == -1) {
        return buf;
    }

    // to calendar time
    struct tm* tm;
    if ((tm = localtime((const time_t*)&tv.tv_sec)) == NULL) {
        return buf;
    }

    snprintf(buf, sizeof(buf),
        "%d-%02d-%02d %02d:%02d:%02d.%03d",
        1900 + tm->tm_year, 1 + tm->tm_mon, tm->tm_mday,
        tm->tm_hour, tm->tm_min, tm->tm_sec,
        (int)(tv.tv_usec / 1000));

    buf[sizeof(buf) - 1] = 0;

    return buf;
}

该函数返回如 2018-02-25 09:32:11 的格式化时间字符串

而 sys/time.h 只是在linux系统上可以调用，在vs2010中：

#include <WinSock.h>
#define SECS_TO_FT_MULT 10000000  
static LARGE_INTEGER base_time;  
 
typedef struct win_time_val  
{  
    /** The seconds part of the time. */  
    long    sec;  
  
    /** The miliseconds fraction of the time. */  
    long    msec;  
  
} win_time_val_t;  
  
typedef struct win_time  
{  
    /** This represents day of week where value zero means Sunday */  
    int wday;  
  
    /** This represents day of month: 1-31 */  
    int day;  
  
    /** This represents month, with the value is 0 - 11 (zero is January) */  
    int mon;  
  
    /** This represent the actual year (unlike in ANSI libc where 
     *  the value must be added by 1900). 
     */  
    int year;  
  
    /** This represents the second part, with the value is 0-59 */  
    int sec;  
  
    /** This represents the minute part, with the value is: 0-59 */  
    int min;  
  
    /** This represents the hour part, with the value is 0-23 */  
    int hour;  
  
    /** This represents the milisecond part, with the value is 0-999 */  
    int msec;  
  
}win_time_t;  
  
// Find 1st Jan 1970 as a FILETIME   
static void get_base_time(LARGE_INTEGER *base_time)  
{  
    SYSTEMTIME st;  
    FILETIME ft;  
  
    memset(&st,0,sizeof(st));  
    st.wYear=1970;  
    st.wMonth=1;  
    st.wDay=1;  
    SystemTimeToFileTime(&st, &ft);  
      
    base_time->LowPart = ft.dwLowDateTime;  
    base_time->HighPart = ft.dwHighDateTime;  
    base_time->QuadPart /= SECS_TO_FT_MULT;  
}  
int win_gettimeofday(win_time_val_t *tv)  
{  
    SYSTEMTIME st;  
    FILETIME ft;  
    LARGE_INTEGER li;  
   static char get_base_time_flag=0;  
  
    if (get_base_time_flag == 0)  
    {  
        get_base_time(&base_time);  
    }  
  
    /* Standard Win32 GetLocalTime */  
    GetLocalTime(&st);  
    SystemTimeToFileTime(&st, &ft);  
  
    li.LowPart = ft.dwLowDateTime;  
    li.HighPart = ft.dwHighDateTime;  
    li.QuadPart /= SECS_TO_FT_MULT;  
    li.QuadPart -= base_time.QuadPart;  
  
    tv->sec = li.LowPart;  
    tv->msec = st.wMilliseconds;  
  
    return 0;  
}
int win_time(const win_time_val_t *tv, win_time_t *time)  
{  
    LARGE_INTEGER li;  
    FILETIME ft;  
    SYSTEMTIME st;  
  
    li.QuadPart = tv->sec;  
    li.QuadPart += base_time.QuadPart;  
    li.QuadPart *= SECS_TO_FT_MULT;  
  
    ft.dwLowDateTime = li.LowPart;  
    ft.dwHighDateTime = li.HighPart;  
    FileTimeToSystemTime(&ft, &st);  
  
    time->year = st.wYear;  
    time->mon = st.wMonth-1;  
    time->day = st.wDay;  
    time->wday = st.wDayOfWeek;  
  
    time->hour = st.wHour;  
    time->min = st.wMinute;  
    time->sec = st.wSecond;  
    time->msec = tv->msec;  
  
    return 0;  
}  
const char* srs_human_format_time()
{
    static char buf[23]; 
    memset(buf, 0, sizeof(buf));

	win_time_val_t wintv;  
    win_time_t wintime;  
    win_gettimeofday(&wintv);  
    win_time(&wintv,&wintime);  
          
	_snprintf(buf,sizeof(buf),"%d-%d-%d %d:%d:%d",  
            wintime.year,wintime.mon+1,wintime.day,  
            wintime.hour,wintime.min,wintime.sec);
    buf[sizeof(buf) - 1] = 0;

    return buf;
}

最后在main方法里：

printf("%s", srs_human_format_time());