System.ArgumentOutOfRangeException: The added or subtracted value results in an un-representable DateTime. (Parameter 't')

[wxyer]

sometime compute wont wrong,i position the code `

        var before = maxElTime - deltaTime;

        if (clipToStartTime) // ensure before is clipped for max elevation search
        {
            before = start > before ? start : before;
        }

` should alert the maxElTime is after DateTime.MinValue;