润年计算方式

取自mainstoneIII bsp,方便以后查询。

闰年：

1. 能被4整除，但不能被100整除

2.能被4整除，而且能被100和400同时整除

//------------------------------------------------------------------------------
// Check the year value to determine if this is a leap year or not
//
BOOL IsLeapYear(WORD wYear)
{
BOOL leap = FALSE;

// Leap years must be a multiple of 4
if ((wYear % 4) == 0)
{
leap = TRUE;

// It is not a leap year if it is a multiple of 100
if ((wYear % 100) == 0)
{
leap = FALSE;

// Unless it is a multiple of 400
if ((wYear % 400) == 0)
{
leap = TRUE;
}
}
}

return leap;
}