public void Test_WallClockTime_AddTrueMilliseconds_And_SubtractTrueMilliseconds_Works_With_Zero(
int year, int month, int day, int second)
{
//Arrange
var dto = new DateTimeOffset(year, month, day, 0, 0, second, TimeSpan.Zero);
var wct = WallClockTime.FromApproximateDateTimeOffset(dto);
//Act
var addResult = wct.AddTrueMilliseconds(0);
var substractResult = addResult.SubtractTrueMilliseconds(0);
//Assert
Assert.IsTrue(substractResult.Equals(wct));
Assert.IsTrue(substractResult.Equals(addResult));
Assert.IsTrue(wct.Equals(addResult));
Assert.AreEqual(substractResult.ToApproximateDateTimeOffset(), dto);
Assert.AreEqual(addResult.ToApproximateDateTimeOffset(), dto);
}
public void Test_WallClockTime_AddTrueMilliseconds_And_SubtractTrueMilliseconds_With_Different_Offsets_Results_In_Expected_Date(
int year, int month, int day, int hour, int offsetHour, int secondsToAddAndSubstract, int expectedLeapSeconds)
{
//Arrange
var msToAddAndSubstract = secondsToAddAndSubstract * 1000;
var dto = new DateTimeOffset(year, month, day, hour, 59, 59, new TimeSpan(offsetHour, 0, 0));
var wct = WallClockTime.FromApproximateDateTimeOffset(dto);
//Act
var addResult = wct.AddTrueMilliseconds(msToAddAndSubstract);
var substractResult = addResult.SubtractTrueMilliseconds(msToAddAndSubstract);
//Assert
Assert.IsTrue(substractResult.Equals(wct));
Assert.IsTrue(substractResult >= wct);
Assert.IsTrue(substractResult == wct);
Assert.IsTrue(substractResult <= addResult);
Assert.IsTrue(substractResult < addResult);
Assert.IsTrue(substractResult != addResult);
Assert.IsTrue(addResult > wct);
Assert.AreEqual(substractResult.ToApproximateDateTimeOffset(), dto);
Assert.AreEqual(addResult.ToApproximateDateTimeOffset(), dto.AddMilliseconds(msToAddAndSubstract - expectedLeapSeconds * 1000));
}
public void Test_WallClockTime_FromApproximateDateTimeOffset_And_FromPseudoMilliseconds_Difference_Between_Dates_Results_In_Expected_Number_Of_Leap_Seconds(
int startYear, int startMonth, int expectedSeconds)
{
//Arrange
var dtoStart = new DateTimeOffset(startYear, startMonth, 1, 0, 0, 0, TimeSpan.Zero);
var dtoNow = new DateTimeOffset(2025, 6, 1, 0, 0, 0, TimeSpan.Zero);
var wctStart = WallClockTime.FromApproximateDateTimeOffset(dtoStart);
var wctNow = WallClockTime.FromApproximateDateTimeOffset(dtoNow);
var wctStart2 = WallClockTime.FromPseudoMilliseconds(dtoStart.ToUnixTimeMilliseconds());
var wctNow2 = WallClockTime.FromPseudoMilliseconds(dtoNow.ToUnixTimeMilliseconds());
//Act
var dtoDiff = dtoNow - dtoStart;
var wctDiff = wctNow - wctStart;
var wctDiff2 = wctNow2 - wctStart2;
var leapSeconds = (wctDiff - dtoDiff).TotalSeconds;
var leapSeconds2 = (wctDiff2 - dtoDiff).TotalSeconds;
//Assert
Assert.AreEqual(expectedSeconds, leapSeconds);
Assert.AreEqual(expectedSeconds, leapSeconds2);
}
public void Test_WallClockTime_AddTrueMilliseconds_And_SubtractTrueMilliseconds_Works_With_Negative_Numbers(
int year, int month, int day, int second, int negativeOrZeroSeconds, int expectedLeapSeconds)
{
//Arrange
var negativeOrZeroMs = negativeOrZeroSeconds * 1000;
var dto = new DateTimeOffset(year, month, day, 0, 0, second, TimeSpan.Zero);
var wct = WallClockTime.FromApproximateDateTimeOffset(dto);
//Act
var addResult = wct.AddTrueMilliseconds(negativeOrZeroMs);
var substractResult = addResult.SubtractTrueMilliseconds(negativeOrZeroMs);
//Assert
Assert.IsTrue(substractResult.Equals(wct));
Assert.IsTrue(substractResult <= wct);
Assert.IsTrue(substractResult == wct);
Assert.IsTrue(substractResult >= addResult);
Assert.IsTrue(substractResult > addResult);
Assert.IsTrue(substractResult != addResult);
Assert.IsTrue(addResult < wct);
Assert.AreEqual(substractResult.ToApproximateDateTimeOffset(), dto);
Assert.AreEqual(addResult.ToApproximateDateTimeOffset(), dto.AddMilliseconds(negativeOrZeroMs + expectedLeapSeconds * 1000));
}