public void TestTimeZone()
{
TimeZoneInfo tz = TimeZoneUtil.FindTimeZoneById("Eastern Standard Time");
HolidayCalendar c = new HolidayCalendar();
c.TimeZone = tz;
DateTimeOffset excludedDay = new DateTimeOffset(2012, 11, 4, 0, 0, 0, TimeSpan.Zero);
c.AddExcludedDate(excludedDay.DateTime);
// 11/5/2012 12:00:00 AM -04:00 translate into 11/4/2012 11:00:00 PM -05:00 (EST)
DateTimeOffset date = new DateTimeOffset(2012, 11, 5, 0, 0, 0, TimeSpan.FromHours(-4));
Assert.IsFalse(c.IsTimeIncluded(date), "date was expected to not be included.");
Assert.IsTrue(c.IsTimeIncluded(date.AddDays(1)));
DateTimeOffset expectedNextAvailable = new DateTimeOffset(2012, 11, 5, 0, 0, 0, TimeSpan.FromHours(-5));
DateTimeOffset actualNextAvailable = c.GetNextIncludedTimeUtc(date);
Assert.AreEqual(expectedNextAvailable, actualNextAvailable);
}