/// <summary>
/// Returns the count of the occurrences a given DayOfWeek in a
/// month of a particular year
/// </summary>
/// <param name="day"></param>
/// <param name="month"></param>
/// <param name="year"></param>
/// <returns></returns>
public static int DayOfWeekCount(DayOfWeek day, int month, int year)
{
int returnValue = 0;
int daysInMonth = DateTime.DaysInMonth(year, month);
int extraDays = daysInMonth % 7;
DayOfWeek firstDayOfMonth = (new DateTime(year, month, 1)).DayOfWeek;
if (extraDays > 0)
{
if (extraDays == 1 && day == firstDayOfMonth)
{
returnValue = 5;
}
else if (extraDays == 2 && (day == firstDayOfMonth || day == (firstDayOfMonth.AddDays(1))))
{
returnValue = 5;
}
else if (extraDays == 3 && (day == firstDayOfMonth || day == (firstDayOfMonth.AddDays(1)) || day == (firstDayOfMonth.AddDays(2))))
{
returnValue = 5;
}
else
{
returnValue = 4;
}
}
else
{
//
// There are always 4 occurrences
//
returnValue = 4;
}
return(returnValue);
}
public static IEnumerable <DayOfWeek> GetDaysBetween(this DayOfWeek from, DayOfWeek to, bool includeBoundary = true)
{
if (includeBoundary)
{
yield return(from);
}
if (from != to)
{
var next = from.AddDays(1);
while (next != to)
{
yield return(next);
next = next.AddDays(1);
}
}
if (includeBoundary && from != to)
{
yield return(to);
}
}
