Ability to set reoccuring holidays by day rather than date, e.g. "First Monday in June"

Ability to set reoccuring holidays by day rather than date, e.g. "First Monday in June"

Hi,
I have a proposed feature
 
When inputting annual holidays, there is only the option to repeate specific dates, e.g. New Years Day. But some of our holidays occur on a specific day rather than a specific date.  For example there is a holiday on "The first Monday in June". It is not possible currently to make this recurring in SDP, as the date changes each year.
 
I presume other regions have the same issue.
 
Regards,
Fintan
 

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