title: Powerbuilder Date Math
body: <p>How do I subtract 30 days from a date in PowerBuilder?</p>
  
  <p>I have the following code that returns today's date in a parameter, but I need today - 30 days:   </p>
  
  <blockquote>
    <p>dw_1.setitem(1, "begin_datetime",
    datetime(today(), Now()))</p>
  </blockquote>