Performance equation to calculate the 4th thursday of November

Hi guys,

I'm trying to calculate a performance equation to identify the Thanksgiving day (the 4th thursday of November). I can't find a function like this:

• WeekDayMonth(n, weekday, month, year)

For example: If we know the day of 4th (n=4) thursday (weekday=5) of current november (month=11, year=2014)

• WeekDayMonth(4, 5, 11, 2014) = 27/11/2014

Is there any way to calculate this in a PE?

Is there any API for PEs to make this function and deploy it in a PI server?

The final PE could be:

if ParseTime("*")  = WeekDayMonth(4, 5, 11, Year("*")) then 1 else 0

Thank you in advance