I have a due date in one list that needs to be populated by a workflow to calculate the date received plus the payment terms. So, if the date received is 4/3/2013 and the terms are 30 then the resulting due date needs to be 5/2/2013. How do I setup this calculation in a workflow using Sharepoint Designer 2013?
Use the "Add Time to Date" action in SPD 2013
See this for reference: http://msdn.microsoft.com/en-us/library/jj164026.aspx
Adds a specific time in minutes, hours, days, or months to a date (Year is not supported), and stores the output value as a variable. The date can be a current data, specific date, or a lookup. The ‘Current Date’ value returns UTC midnight