Update Date

I am trying to use a start date (manual entry) for a program "Start_Date" and add 6 weeks to the start date to come up with an end date "End_Date". I want this value to update all of my members in a report so I can see who's program is ending soon. I want it to have an output of just the date in MM-dd-yy format.

currently I am using the following:

startDate = Members[ Start_Date !=null].Start_Date;

endDate = Start_Date.addWeek(6);

startDate.End_Date = endDate;

but I keep getting an error saying that startDate is undefined. I'm sure this is a simple fix but I'm new to coding.

Thank you.

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