Has this ever been implemented?
Instead you should create a function that we can call to give us the number of Working Days instead of trying to calculate anything for us.
Function should be like --
<ToDate> - would be OPTIONAL; but if <option>='to' then you know it is FROM TO DATES
<option> - would be things like 'To, 'Previous 3 Months', 'Previous Month', etc
<FromDate> - would obviously be the "starting point" of the calculation
Finally, this would ALL be based on UTC time unless you want to add another final option <timezone> to allow one to select.
We need a function like this to DYNAMICALLY calculate the number of working days based on our Org Calendar, so it can take into account Holidays and other "anomalies". This can then be used to calculate things like Utilization more accurately; because there are BIG differences between WORK LOAD, BILLABLE TIME, REVENUE GENERATING TIME, etc so we need to be able to do some calculations ourselves...
EVERYONE reading this MUST VOTE; otherwise, no enhancements are ever planned and we ALL needs this...