浅谈时间戳与日期时间互转C语言
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/*
* ctime.h
*
* Created on: May 19, 2016
*
*/
#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;
}
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