ISO8601和UTC 时间，由秒数转化日期时间，日期到秒数

ISO8601和UTC 时间，由秒数转化日期时间，日期到秒数

ISO8601时间格式：2018-6-5T17:46:50Z

UTC时间格式:  2018-06-05T03:46:50+08:00 等同于2018-6-5T11:46:50Z

UTC+时区= localtime；

其中"T"用来分割日期和时间，时间后面跟着的"-07:00"表示西七区，"+08:00"表示东八区。

时区默认是0时区，可以用"Z"表示，也可以不写。
对于我国，要使用"+08:00"，表示东八区。

 

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#include 
#include 
#ifdef WIN32
#include 
#define  snprintf sprintf_s
#else
#include 
#endif


typedef struct dataTime_t
{
    uint16_t wYear;
    uint16_t wMonth;
    uint16_t wDayOfWeek;
    uint16_t wDay;
    uint16_t wHour;
    uint16_t wMinute;
    uint16_t wSecond;
    uint16_t wMilliseconds;
}dataTime_t;


 /*
*获取系统ISO8601时间，字符串表示
*/
 int  GetDataTime_ISO8601(char * data, int size)
{
	time_t time_utc;
	struct tm tm_local;
	time(&time_utc);
#ifdef WIN32
	localtime_s(&tm_local, &time_utc);
#else
	localtime_r(&time_utc, &tm_local);
#endif
	int success = 0;
	success = snprintf(data, size, "%04d-%02d-%02dT%02d:%02d:%02dZ",
		tm_local.tm_year + 1900,
		tm_local.tm_mon + 1,
		tm_local.tm_mday,
		tm_local.tm_hour,
		tm_local.tm_min,
		tm_local.tm_sec);

	return success;
}
/*
*获取时区
*/
 int  GetTimeZone(int &nTimeZone)
{
	struct tm tm_local;
	time_t time_utc;
	// Get the UTC time
	time(&time_utc);    //当前时间的秒数
	// Get the local time
	// Use localtime_r for threads safe
#ifdef WIN32
	localtime_s(&tm_local, &time_utc);
#else
	localtime_r(&time_utc, &tm_local);
#endif
	time_t time_local;
	// Change tm to time_t
	time_local = mktime(&tm_local);
	struct tm tm_gmt;
	// Change it to GMT tm
#ifdef WIN32
	gmtime_s(&tm_gmt, &time_utc);
#else
        gmtime_r(&time_utc, &tm_gmt);;
#endif  

	int time_zone = tm_local.tm_hour - tm_gmt.tm_hour;
	if (time_zone < -12) {
		time_zone += 24;
	}else
	if (time_zone > 12) {
		time_zone -= 24;
	}
	nTimeZone = time_zone;
	return time_zone;
}

/*
*ISO8601或者UTC格式的时间，将字符串时间转换为 dataTime_t对象
*/

int GetDataTime_ISO8601_UTC_DataTime(const char * lpStringdata, int nStringSize, dateTime_t *lpDataTime)
{
	int lsuccess = 0;
	//2018-06-01T08:32:56.000Z   /2018-06-01T08:32:56Z  
    int lTimeZone = 0;
    if (lpStringdata == NULL || nStringSize < 20 ) return -1;
    
    char * lpSource = (char *)lpStringdata;

    char lpdate[6] = { 0 };
    strncpy(lpdate, lpSource, 4);
    lpdate[4] = '\0';
    lpDataTime->wYear = atoi(lpdate);

    char *llpSource = lpSource + 5;
    if (llpSource==NULL)  return -1;
    strncpy(lpdate, llpSource, 2);
    lpdate[2] = '\0';
    lpDataTime->wMonth = atoi(lpdate);

    llpSource = llpSource + 3;
    if (llpSource == NULL)  return -1;
    strncpy(lpdate, llpSource, 2);
    lpdate[2] = '\0';
    lpDataTime->wDay = atoi(lpdate);

    llpSource = llpSource + 3;
    if (llpSource == NULL)  return -1;
    strncpy(lpdate, llpSource, 2);
    lpdate[2] = '\0';
    lpDataTime->wHour = atoi(lpdate);

    llpSource = llpSource + 3;
    if (llpSource == NULL)  return -1;
    strncpy(lpdate, llpSource, 2);
    lpdate[2] = '\0';
    lpDataTime->wMinute = atoi(lpdate);


    llpSource = llpSource + 3;
    if (llpSource == NULL)  return -1;
    strncpy(lpdate, llpSource, 2);
    lpdate[2] = '\0';
    lpDataTime->wSecond = atoi(lpdate);

/*
* 2018-06-01T08:32:56Z
* 2018-06-01T08:32:56+08:00
* 2018-06-01T08:32:56.000Z
* 2018-06-01T08:32:56.000+08:00
*/
    llpSource = llpSource + 2;
    if (llpSource == NULL)  return -1;
    strncpy(lpdate, llpSource, 1);
    lpdate[1] = '\0';

    if (strcmp(lpdate, ".") == 0)
    {
        char *lpbuffer = llpSource + 1;
        if (lpbuffer == NULL)  return -1;
        char buffer[4] = { 0 };
        strncpy(buffer, lpbuffer, 3);
        buffer[3] = '\0';
        lpDataTime->wMilliseconds = atoi(buffer);

        char * lptime = lpbuffer + 3;
        char buf[6] = { 0 };
        if (lptime == NULL) return -1;
        strncpy(buf, lptime, 1);
        buf[1] = '\0';
        if (strcmp(buf, "+") == 0)
        {
            lptime = lptime + 1;
            if (lptime == NULL)  return -1;
            strncpy(buf, lptime, 2);
            buf[2] = '\0';
            lTimeZone = atoi(buf);
        }
    }
    if (strcmp(lpdate, "+") == 0)
    {
        llpSource = llpSource + 1;
        if (llpSource == NULL)  return -1;
        strncpy(lpdate, llpSource, 2);
        lpdate[2] = '\0';
        lTimeZone = atoi(lpdate);
    }

    printf("time : %4d/%d/%d %2d:%d:%d.%3d + %d:00", lpDataTime->wYear, lpDataTime->wMonth, lpDataTime->wDay, lpDataTime->wHour, lpDataTime->wMinute, lpDataTime->wSecond,lpDataTime->wMilliseconds,lTimeZone);

/////////////////////////////////////////////////////////////////////////////////
 
	return lsuccess;
}

/*
* 得到系统时间
*/

int GetLocalTime(dateTime_t *lpDateTime)
{
	int32_t lsuccess = 0;
#ifdef WIN32

   SYSTEMTIME *lpSystemTime = (SYSTEMTIME *)lpDataTime;
   GetLocalTime(lpSystemTime);
#else
	struct timeval     nowTime = { 0 };
	lsuccess = gettimeofday(&nowTime, 0);
	time_t time = (time_t)nowTime.tv_sec;
	struct tm ntm, *ptm = &ntm; 

        localtime_r(&time, &ntm);

	lpDataTime->wYear = ptm->tm_year + 1900;
	lpDataTime->wMonth = ptm->tm_mon + 1;
	lpDataTime->wDayOfWeek = ptm->tm_wday;
	lpDataTime->wDay = ptm->tm_mday;
	lpDataTime->wHour = ptm->tm_hour;
	lpDataTime->wMinute = ptm->tm_min;
	lpDataTime->wSecond = ptm->tm_sec;
	lpDataTime->wMilliseconds = nowTime.tv_usec / 1000;
#endif
	return lsuccess;
}

/*
* 设置系统时间
*/

int  SetLocalTime(dateTime_t *lpDateTime)
{
    int32_t lsuccess = 0;
#ifdef WIN32
    SYSTEMTIME *lpSystemTime = (SYSTEMTIME *)lpDataTime;
    lsuccess = SetLocalTime(lpSystemTime);
#else
    struct tm  _tm = { 0 };
    _tm.tm_sec = lpDataTime->wSecond;
    _tm.tm_min = lpDataTime->wMinute;
    _tm.tm_hour = lpDataTime->wHour;
    _tm.tm_mday = lpDataTime->wDay;
    _tm.tm_mon = lpDataTime->wMonth -1;
    _tm.tm_year = lpDataTime->wYear - 1900;

    struct timeval tv;
    tv.tv_sec = mktime(&_tm);
    tv.tv_usec = 0;
    if (settimeofday(&tv, (struct timezone *) 0) < 0)
    {
        printf("Set system datetime error!\n");
        return -1;
    }
#endif

    return lsuccess;
}

/*
* 设置系统时间
*/
 int SetLocalTimeAddTZ(dateTime_t *lpDateTime, int ltimezone)
{
    int32_t  lsuccess = 0;
    int llSecond = ltimezone * 3600;

    struct tm _tm = { 0 };
    _tm.tm_sec = lpDataTime->wSecond;
    _tm.tm_min = lpDataTime->wMinute;
    _tm.tm_hour = lpDataTime->wHour;
    _tm.tm_mday = lpDataTime->wDay;
    _tm.tm_mon = lpDataTime->wMonth -1;
    _tm.tm_year = lpDataTime->wYear - 1900;

    time_t timeSeconds = mktime(&_tm);
    time_t CountSecond = timeSeconds + llSecond;

#ifdef WIN32

    struct tm timer, *time = &timer;
     localtime_s(time,&CountSecond);
    lpDataTime->wYear = time->tm_year + 1900;
    lpDataTime->wMonth = time->tm_mon +1;
    lpDataTime->wDayOfWeek = time->tm_wday;
    lpDataTime->wDay = time->tm_mday;
    lpDataTime->wHour = time->tm_hour;
    lpDataTime->wMinute = time->tm_min;
    lpDataTime->wSecond = time->tm_sec;

    SYSTEMTIME *lpSystemTime = (SYSTEMTIME *)lpDataTime;
    avx_success = SetLocalTime(lpSystemTime);

    printf("Time+TZ: %4d/%d/%d  %2d:%d:%d\n", lpSystemTime->wYear, lpSystemTime->wMonth, lpSystemTime->wDay,
        lpSystemTime->wHour, lpSystemTime->wMinute, lpSystemTime->wSecond);
#else

    struct timeval tv;
    tv.tv_sec = CountSecond;
    tv.tv_usec = 0;

    if (settimeofday(&tv, (struct timezone *) 0) < 0)
    {
        printf("Set system datatime error!\n");
        return -1;
    }
#endif
    return lsuccess;
}
/*
* function :get current time 
* out   : Seconds/Millisecond
*/
int64_t SKY_GetUTCTime()
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
/*
* input :Seconds/Millisecond
* out   : date struct(yyyy/mm/dd hh/mm/ss)
*/
int  SKY_GetDataTimeFromUTCTime(int64_t llUTCTime,dataTime_t *lpDataTime)
{
    struct tm timer, *time = &timer;
    int64_t  llUTCTimeSecond = llUTCTime / 1000000;
    int64_t  llUTCTimeMicros = llUTCTime % 1000000;
#ifdef _WIN32
    localtime_s(time,(time_t*)&llUTCTimeSecond);
#else
    localtime_r((time_t*)&llUTCTimeSecond,time);
#endif
    lpDataTime->wYear = time->tm_year + 1900;
    lpDataTime->wMonth = time->tm_mon + 1;
    lpDataTime->wDayOfWeek = time->tm_wday;
    lpDataTime->wDay = time->tm_mday;
    lpDataTime->wHour = time->tm_hour;
    lpDataTime->wMinute = time->tm_min;
    lpDataTime->wSecond = time->tm_sec;
    lpDataTime->wMilliseconds = llUTCTimeMicros / 1000;
    return 0;
}
/*
* input :date struct(yyyy/mm/dd hh/mm/ss)
* out   : Seconds/Millisecond
*/
int64_t SKY_GetUTCTimeFromDataTime(dataTime_t *lpDataTime)
{
    struct tm  _tm = { 0 };
    _tm.tm_sec = lpDataTime->wSecond;
    _tm.tm_min = lpDataTime->wMinute;
    _tm.tm_hour = lpDataTime->wHour;
    _tm.tm_mday = lpDataTime->wDay;
    _tm.tm_mon = lpDataTime->wMonth - 1;
    _tm.tm_year = lpDataTime->wYear - 1900;
//  time_t  llUTCTimeSecond = mktime(&_tm);    //此处在不同平台可能会出现异常
    int64_t llUTCTimeSecond = mktime(&_tm); 
    int64_t llUTCTimeMicros = lpDataTime->wMilliseconds * 1000;
    int64_t llUTCTime = llUTCTimeSecond * 1000000 + llUTCTimeMicros;
    return  llUTCTime;
} 

在项目过程中涉及到时间操作相关的细节问题，现在将常用的方法整理出来，方便大家借鉴，同时发现问题，请积极提出。