public Week(int year, int weekNumber)
: base(StartTimeFromWeek(year, weekNumber),
TimeSpan.FromDays(weekNumber != 1 ? 7 : DateTimeAdditions.GetDaysInFirstWeek(year)))
{
Year = year;
Number = weekNumber;
}
static DateTime StartTimeFromWeek(int year, int weekNumber)
{
var start = new DateTime(year, 1, 1, 0, 0, 0, 0, DateTimeAdditions.StandardCalendar, DateTimeKind.Utc);
if (weekNumber > 1)
{
start = start.AddDays(DateTimeAdditions.GetDaysInFirstWeek(year));
weekNumber--;
}
return(start.AddDays(7 * (weekNumber - 1)));
}