根据日期获得星期几

转载于 2019-03-11 19:07:37 发布 · 368 阅读

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#日期 #星期 #C代码

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//根据日期获得星期几
unsigned char CaculateWeekDay(int y,int m, int d)
{
   unsigned char buf;
if(m==1||m==2) {
m+=12;
y--;
}
int iWeek=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7;
switch(iWeek)
{
case 0: printf("星期一\n");
               buf = 0x02;
               break;
case 1: printf("星期二\n");
               buf = 0x04;
               break;
case 2: printf("星期三\n");
               buf = 0x08;
               break;
case 3: printf("星期四\n");
               buf = 0x10;
               break;
case 4: printf("星期五\n");
               buf = 0x20;
               break;
case 5: printf("星期六\n");
               buf = 0x40;
               break;
case 6: printf("星期日\n");
               buf = 0x80;
               break;
   default :
               break;
}
   printf("buf : %x\n",buf);
   return buf;
}