public void ErinnTimeToString()
{
var time1 = new ErinnTime(DateTime.Parse("2015-01-01 00:00"));
Assert.Equal("550-4-01 00:00", time1.ToString());
Assert.Equal("0550-04-01 0:0", time1.ToString("yyyy-MM-dd H:m"));
Assert.Equal("00:00 AM", time1.ToString("HH:mm tt"));
var time2 = new ErinnTime(DateTime.Parse("2015-01-01 23:59"));
Assert.Equal("23:20 PM", time2.ToString("HH:mm tt"));
}