Hello, you can definitely achieve this by using C# expression to calculate the End Date.

Assuming you have all 3 as Var (2 date type and 1 num), in an Update Variable step the End Date var will have this value

To add any number of days to a provided date

//Get the variable containing your date/time, parse it, and add or subtract days indicated (by indicating a positive or negative number)

DateTime.Parse(GetVariableValue("StartDate")).AddDays(GetVariableValue("NoOfDays"))

Remember: the expression above does not take into account just business working days. in that case i would use this expression to calculate it:

//Create a new variable called 'current', and set it to the system dateTime for today

var current = System.DateTime.Today;

//Create a variable called 'daysToAdd' and load it with the number from your workflow variable

var daysToAdd = Int32.Parse(GetVariableValue("YOUR_VARIABLE").ToString());

//Add days until the number of indicated days is reached   

for (var i = 0; i < daysToAdd; i++) {  

if (current.DayOfWeek != DayOfWeek.Friday) {    

current = current.AddDays(1);  

} 

else {    

current = current.AddDays(3);  

}

}

return current;

Wow, Thank you so much for this answer. I will try it today and then update this post again. Your explanation is so clear and easy to follow too.

I get this error. StartDate is a Date, Interval is a Num, EndDate which is this variable I am setting the expression below to is a Date. I tried with ; and without but I know that could not be it. I did set StartDate above as System.DateTime.Today;

Compilation failed: (1:71) Argument 1: cannot convert from 'string' to 'double' - Reference Id: d9a9665f-d171-427f-86d8-f4a8636aeaa5

Hey I think the issue is that DateTime.Parse(GetVariableValue("StartDate")).AddDays(GetVariableValue("NoOfDays")) The part in bold wants to return a string and so I need to know how to add the part that converts NoOfDays back into a number

Hello, i know there is a way to turn strings into numbers and viceversa in C# with Convert. e.g Convert.ToInt32("string")

however, I was under the impression that NoOfDays was a number Var. if not, why don't you make it consisted my converting the attribute into a NUmber Var?

I still can't figure this out 

Getting this error. I have StartDate as a Date Variable and NumberofDays as a number and I am trying to set a Date variable.

Resolved this in another thread and confirmed it worked:​

​

If it’s complaining that GetVariableValue("NumberOfDays") is a String rather than a Number, could you try forcing it to an Int?

​

DateTime.Parse(GetVariableValue("StartDate")).AddDays(Int32.Parse(GetVariableValue("NumberOfDays")))

Very useful!