public void RoundHalfFloor()
 {
     DateTimeField field = new StubDateTimeField();
     Assert.AreEqual(0L, field.RoundHalfFloor(new LocalInstant(0L)).Ticks);
     Assert.AreEqual(0L, field.RoundHalfFloor(new LocalInstant(29L)).Ticks);
     Assert.AreEqual(0L, field.RoundHalfFloor(new LocalInstant(30L)).Ticks);
     Assert.AreEqual(60L, field.RoundHalfFloor(new LocalInstant(31L)).Ticks);
     Assert.AreEqual(60L, field.RoundHalfFloor(new LocalInstant(60L)).Ticks);
 }