title: DateAdd - SQL expression
body: <p>I am trying to create an expression with SQL. The expression value is trying to assign a value to the days of the week. Sunday is 1 through to Saturday which is 7. I am then trying to add 5 days if it is a Monday so that it lands on a Friday otherwise every other day add 7 days. E.g.</p>
  
  <pre><code>WeekDay Inlist("2",",") DateAdd(5, "d") OR ds WeekDay Inlist("1,3,4,5,6,7",",") DateAdd(7, "d")
  </code></pre>
  
  <p>However this does not seem to work?
  So basically I enter my date in a databox as 15/03/2017 which is a Wednesday,
  Our expression would say if its a Monday to add 5 days and therefore result in false. Because its a Wednesday we would need to say add 7 days, this ignores Saturday and Sunday and therefore would result in True. This would land on the following Wednesday.</p>
  
  <p>Any ideas? :D </p>