Fixed Public holiday in Factory Calendar

Hello All,

I an trying to understand how can I define a fixed holiday in a Factory Calendar.

I understand the process of defining a public holiday and assigning it to Factory calendar but what I want is a fixed holiday every month.

So how can I define a holiday in which we would like to have 2nd monday(or any other day) of every month as a holiday.

Please let me know

Thanks

SAP Fans..