通過日期計(jì)算出星期
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星期是固定的以7天作為周期進(jìn)行計(jì)算的，所以，只要通過日期獲取，具體的天數(shù)，通過對(duì)7作為周期計(jì)算就可以獲取星期值了，具體的函數(shù)如下：
/**************************************************************************************
* FunctionName : GetWeek()
* Description : 通過日期獲取周
* EntryParameter : year, month, day - 日期
* ReturnValue : 返回周
**************************************************************************************/
U8 GetWeek(U8 year, U8 month, U8 day)
{
U8 i, y, m, d, weekDay;
U16 ti = 2000;
U32 days = 0;
y = (year >> 4) * 10 + (year & 0x0F);
m = (month >> 4) * 10 + (month & 0x0F);
d = (day >> 4) * 10 + (day & 0x0F);
for (i = 0; i
{
if ((ti % 4) == 0 && (ti % 100) != 0 || (ti % 400) == 0)
{
days += 366;
}
else
{
days += 365;
}
ti++;
}
for (i = 1; i
{
switch (i)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
{
days += 31;
break;
}
case 2:
{
ti = 2000 + y;
if ((ti % 4) == 0 && (ti % 100) != 0 || (ti % 400) == 0)
{
days += 29;
}
else
{
days += 28;
}
break;
}
case 4:
case 6:
case 9:
case 11:
{
days += 30;
break;
}
}
}
days += d;
weekDay = (days % 7) + 5;
weekDay %= 7;
return weekDay;
}
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