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Exception: The difference between start and finish date cannot be more than 50 years on setting only end date (C# .NET)

#1

Hi , I try create task only with end date. But get the exception The difference between start and finish date cannot be more than 50 years

        var license = new License();
        Stream licenseStream =
            Assembly.GetExecutingAssembly().GetManifestResourceStream(
                "Aspose_test_Solution.Aspose.Tasks.lic");
        license.SetLicense(licenseStream);

        var project = new Project();
      
        var task = project.RootTask.Children.Add("Task without dates");

        // we need have empty task without start date , end date and duration, just empty task
        task.Set(Tsk.DurationText, string.Empty);  // don't clean duration Why and how do it?
        task.Set(Tsk.FinishText, string.Empty);
        task.Set(Tsk.ActualFinish, DateTime.MinValue);

        task.Set(Tsk.ActualStart, DateTime.MinValue);
        task.Set(Tsk.StartText, string.Empty);
        // we need have empty task without start date , end date and duration, just empty task

        var endDate = new DateTime(2019,7,30);
        
        task.Set(Tsk.ActualFinish, endDate);  //<--- Exception 'The difference between start and finish date cannot be more than 50 years.'
#2

@LogicSoft,

I have observed the sample code shared by you and also the exception message. Actually, you are using MinDate as start and 2019-07-30 as end date. As evident from exception message the start and end date cannot have difference greater than 50 years. You need to please set appropriate start date to verify on your end.

#3

Hello @LogicSoft
You can do it as follows by setting the project’s CalculationMode to Manual

	var project = new Project() { CalculationMode = CalculationMode.Manual };

var task = project.RootTask.Children.Add("Task without dates");

// we need have empty task without start date , end date and duration, just empty task
task.Set(Tsk.DurationText, string.Empty);  // don't clean duration Why and how do it?
task.Set(Tsk.FinishText, string.Empty);
task.Set(Tsk.ActualFinish, DateTime.MinValue);

task.Set(Tsk.ActualStart, DateTime.MinValue);
task.Set(Tsk.StartText, string.Empty);
// we need have empty task without start date , end date and duration, just empty task

var endDate = new DateTime(2019,7,30);

task.Set(Tsk.ActualFinish, endDate); 
project.Save("out.xml", SaveFileFormat.XML);

But it does not make any sense to do that, because in this case you are getting a broken task. Hope by using my solution from this topic you won’t need this piece of code.