public void AddPreciseDaysTest(DateTime date, double day) { DateTime date1 = date.AddPreciseDays(day); DateTime date2 = date.AddDays(day); Assert.AreNotEqual(0, date1.Ticks % 10000); Assert.AreEqual(0, date2.Ticks % 10000); Assert.IsTrue(Math.Abs(date1.Ticks / 10000 - date2.Ticks / 10000) <= 1); }