calculate if a date is in a dutch school vacation

protected DateTime getFirstWednesdayOfMonth(DateTime seedDate) { DateTime wed1 = new DateTime(seedDate.Year, seedDate.Month, 1); //1st Wednesday can start on the 1st of the month while (wed1.DayOfWeek != DayOfWeek.Wednesday) {         wed1 = wed1.AddDays(1); } return wed1; }  protected DateTime getThirdWednesdayOfMonth(DateTime seedDate) { DateTime wed3 = new DateTime(seedDate.Year, seedDate.Month, 15); //3rd Wednesday cannot start prior to the 15th of the month while (wed3.DayOfWeek != DayOfWeek.Wednesday) {         wed3 = wed3.AddDays(1); } return wed3; } protected void Button1_Click(object sender, EventArgs e) { DateTime Now = DateTime.Today; DateTime wed1 = getFirstWednesdayOfMonth(Now); DateTime wed3 = getThirdWednesdayOfMonth(Now); if (Now < wed1) {         lblDate.Text = wed1.ToString(); } else if (Now < wed3) {         lblDate.Text = wed3.ToString(); } }

You need to find out how they decide summer vacations every year, if it is same every year(like it starts first friday of june ends first monday of September), you can do it..