时间戳与日期时间互转C语言

/*

 * ctime.h

 *

 *  Created on: May 19, 2016

 *      Author: root

 */

 

#ifndef CTIME_H_

#define CTIME_H_

#include "common/micro_type.h"

#define OFFSET_SECOND     946684800  /* ��1970/1/1/0/0/0��2000/1/1/0/0/0֮���������  */

//#define OFFSET_SECOND   0          /* ��2000/1/1/0/0/0��2000/1/1/0/0/0֮���������  */

#define SECOND_OF_DAY     86400      /* 1�������                                     */

 

typedef struct date_time

{

    uint16   iYear;

    uint16   iMon;

    uint16   iDay;

 

    uint16   iHour;

    uint16   iMin;

    uint16   iSec;

    uint16   iMsec;

} DATE_TIME;

 

void GetDateTimeFromSecond(unsigned long lSec, DATE_TIME *tTime);

#endif /* CTIME_H_ */

/*

 * ctime.c

 *

 *  Created on: May 19, 2016

 *      Author: root

 */

#include "common/micro_type.h"

#include "ctime.h"

uint8 DayOfMon[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

 

/* ������1970/1/1/0/0/0�����ʱ */

unsigned long GetSecondTime(DATE_TIME *date_time)

{

    uint16 iYear, iMon, iDay, iHour, iMin, iSec;

    iYear = date_time->iYear;

    iMon = date_time->iMon;

    iDay = date_time->iDay;

    iHour = date_time->iHour;

    iMin = date_time->iMin;

    iSec = date_time->iSec;

 

    uint16 i, Cyear=0;

    unsigned long CountDay=0;

 

    for(i=1970; i<iYear; i++)     /* ͳ��1970�굽����֮ǰ�������� */

    {

        if(((i%4==0) && (i%100!=0)) || (i%400==0))  Cyear++;

    }

    CountDay = Cyear * 366 + (iYear-1970-Cyear) * 365;

    for(i=1; i<iMon; i++)

    {

        if((i==2) && (((iYear%4==0)&&(iYear%100!=0)) || (iYear%400==0)))

            CountDay += 29;

        else

            CountDay += DayOfMon[i-1];

    }

    CountDay += (iDay-1);

 

    CountDay = CountDay*SECOND_OF_DAY + (unsigned long)iHour*3600 + (unsigned long)iMin*60 + iSec;

    return CountDay;

}

 

/* ����ʱ�������1970/1/1/0/0������ */

void GetDateTimeFromSecond(unsigned long lSec, DATE_TIME *tTime)

{

    uint16 i,j,iDay;

    unsigned long lDay;

 

    lDay = lSec / SECOND_OF_DAY;        /* תΪ�������ʱ�� */

    lSec = lSec % SECOND_OF_DAY;

 

    i = 1970;

    while(lDay > 365)

    {

      if(((i%4==0)&&(i%100!=0)) || (i%400==0))    /* ���� */

        lDay -= 366;

      else

        lDay -= 365;

      i++;

    }

    if((lDay == 365) && !(((i%4==0)&&(i%100!=0)) || (i%400==0)))  /* ƽ�� */

    {

      lDay -= 365;

      i++;

    }

    tTime->iYear = i;     /* �õ���� */

    for(j=0;j<12;j++)     /* �����·� */

    {

      if((j==1) && (((i%4==0)&&(i%100!=0)) || (i%400==0)))

        iDay = 29;

      else

        iDay = DayOfMon[j];

      if(lDay >= iDay) lDay -= iDay;

      else break;

    }

    tTime->iMon  = j+1;

    tTime->iDay  = lDay+1;

    tTime->iHour = ((lSec / 3600)+8)%24;//这里注意，世界时间已经加上北京时间差8，

    tTime->iMin  = (lSec % 3600) / 60;

    tTime->iSec  = (lSec % 3600) % 60;

}