Can I include the calendar month in the file name of my employee's pay slips?

I am trying and failing to include the name of the month in my employee pay slips - any ideas?  This is the current script:

 

"Payslip for Tax " + (Employees.PaymentPeriod="Monthly"?"Month:":"Week:") + CurrentPay.ProcessPeriod + ", Tax Year:" + YearFromDate(DateParameters.StartOfTaxYear) + "-" + YearFromDate(DateParameters.EndOfTaxYear)

 

Thanks