UTC与本地时间转换函数

#include "utc2local.h" #include "windows.h" static const unsigned short days2MonthNormal[12] = { 31,//1 31+28,//2 31+28+31,//3 31+28+31+30,//4 31+28+31+30+31,//5 31+28+31+30+31+30,//6 31+28+31+30+31+30+31,//7 31+28+31+30+31+30+31+31,//8 31+28+31+30+31+30+31+31+30,//9 31+28+31+30+31+30+31+31+30+31,//10 31+28+31+30+31+30+31+31+30+31+30,//11 31+28+31+30+31+30+31+31+30+31+30+31,//12 }; static const unsigned short days2MonthRun[12] = { 31,//1 31+29,//2 31+29+31,//3 31+29+31+30,//4 31+29+31+30+31,//5 31+29+31+30+31+30,//6 31+29+31+30+31+30+31,//7 31+29+31+30+31+30+31+31,//8 31+29+31+30+31+30+31+31+30,//9 31+29+31+30+31+30+31+31+30+31,//10 31+29+31+30+31+30+31+31+30+31+30,//11 31+29+31+30+31+30+31+31+30+31+30+31,//12 }; unsigned char IsRunNian(unsigned int year) { //初步判定为闰年.100不闰,400年又闰 if ( year % 4 ) return 0; if ( year % 100 ) return 1; //100不闰,因此要进一步判定 if ( year % 400 ) return 0; else return 1; } void Utc2LocalTime(unsigned int TIME,P_LOCAL_TIME pTime) { /************************************************* * 1970.01.01.THURs * */ int i; // unsigned int hours; // unsigned int minutes; // unsigned int seconds; unsigned int days; unsigned short year = 1970; if (pTime == NULL) { return; } pTime->Second = (TIME % 60); //得到秒余数 TIME = (TIME / 60); //得到整数分钟数 pTime->Minute = (TIME % 60); //得到分钟余数 TIME = (TIME / 60); //得到整数小时数 pTime->Hour = (TIME % 24 ); //得到小时余数 days = TIME = ( TIME / 24 ); //转换为整数天数 pTime->DayOfWeek = (4+(days%7))%7; while ( days>365 ) { if(IsRunNian(year)) days--; days -= 365; year++; } //now days <= 365 if (!IsRunNian(year) && (days== 365) ) { year++; pTime->Month = 1; pTime->Date = 1; pTime->Year = year; return; } pTime->Year = year; //here days <365 if (IsRunNian(year)){ for (i=0;i<12;i++){ if (days < days2MonthRun[i]){ pTime->Month = i+1; if (i == 0){ pTime->Date = days; }else{ pTime->Date = days-days2MonthRun[i-1]; } pTime->Date++; return ;//<-------------------------------- } } }else{ for (i=0;i<12;i++){ if (days < days2MonthNormal[i]){ pTime->Month = i+1; if (i == 0){ pTime->Date = days; }else{ pTime->Date = days-days2MonthNormal[i-1]; } pTime->Date++; return ;//<-------------------------------- } } } return; } unsigned int LocalTime2UTC(P_LOCAL_TIME ptTime) { /* d0 | |<------>| | | ---+--------------+--------------+---------------+-------- | | | | 0 x 400 y 800 1200 |<--------------->| dx = (y-x)%400 */ unsigned int x = 1970; unsigned int y = ptTime->Year; unsigned int days = 0; unsigned int dx = 0,d0 = 0; days += (y-x)/400*(400*365+97); dx = (y-x) % 400; d0 = 400 - x%400; if (dx>d0) { days++; } //------------------------------------------------------------- x += (y-x)/400*400;//新的x位置,此时的100年内变为了4年一闰,百年不闰 /* d0 | |<------>| | | ---+--------------+--------------+---------------+-------------- | | | | 0 x 100 y 200 300 |<--------------->| dx = (y-x)%100 */ days += (y-x)/100*(100*365+24); dx = (y-x)%100; d0 = 100 - (x%100); //如果剩下的小于100年跨度了100整数倍.则闰年少一年.即天数-1;这样在100年内换算成4年必定一闰 if (dx > d0) { days--; } //------------------------------------------------------------- x += (y-x)/100*100;//新的x位置,4年一闰 /* d0 | |<------>| | | ---+--------------+--------------+---------------+-------------- | | | | 0 x 4 y 8 12 |<--------------->| dx = (y-x)%4 */ days += (y-x)/4*(4*365+1); dx = (y-x)%4; d0 = 4- x%4; if (dx>d0) { days++; } //------------------------------------------------------------- x += (y-x)/4*4;//新的x位置,此时已经没有了闰年 /* d0 | |<------>| | | ---+--------------+--------------+---------------+-------------- | | | | 0 x 4 y 8 12 |<--------------->| dx = (y-x)%4 */ days += (y-x)*365; if (ptTime->Month == 1) { days += (ptTime->Date-1); }else{ if(IsRunNian(y)) { days += days2MonthRun[(ptTime->Month-1)-1]; }else{ days += days2MonthNormal[(ptTime->Month-1)-1];//如果给定的月份数为x则,只有x-1个整数月 } days += ptTime->Date-1; } return (days*24*3600 + ptTime->Hour*3600 +ptTime->Minute*60 + ptTime->Second); }