Counting Business Days between Two Dates

To count business days between two dates (startdate and enddate), the following code can be used in a Special Browser script field that will populate a Calculated Value Custom Field with the number of business days between two given dates.

function bus_date_diff()
{
  var frm=document.forms[0];
  var formatdate="@dateformat@";
  var start=ConvertDateStr(frm.startdate.value,formatdate);
  var end=ConvertDateStr(frm.enddate.value,formatdate);
  var diff=datediff(start,end, "D");
  var i=0;
  var busdays=0;
  for(i=0;i<diff;i++)
  {
    var cdate=dateadd(start,'D',i);
    if(!isHoliday(cdate))
    busdays++;
  }
  return busdays;
}

In the Expression section of the Calculated Value Custom Field you would put the following:

bus_date_diff()