How do i add a number of days to a date? (Sodeso Java Wiki)

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How do i add a number of days to a date?

The following JavaScript method provides this functionality:

<html>
  <head>
    <script language="JavaScript">
      function addDays(date, days) {
        return new Date(date.getTime() + days * 24 * 60 * 60 * 1000);
      }
    </script>
  </head>
  <body>
    <input type="button" value="Display 01-01-2007 plus 7 days" onclick="alert(addDays(new Date(2007, 01, 01), 7));"/>
  </body>
</html>

Notice that you have to pass a Date object into the addDays method and not String values.