In many cases, we need to get the day of the week. Many people like to set the day of the week in the clock setting. In fact, there is no need to be so troublesome. We only need to get the date to calculate the day of the week at any time.
The week is calculated with a fixed period of 7 days. Therefore, as long as the date is obtained, the specific day can be obtained by calculating 7 as a period. The specific function is as follows:
/****************************************************** *************************************
* FunctionName : GetWeek()
* Description: Get the week by date
* EntryParameter : year, month, day - date
* ReturnValue: Returns the week
*************************************************** ************************************/
U8 GetWeek(U8 year, U8 month, U8 day)
{
U8 i, y, m, d, weekDay;
U16ti = 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
Reference address：Calculate the day of the week from the date
{
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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