datepicker ranges

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datepicker ranges

I have a datepicker, where selectable dates should be only Fridays and Saturdays every other week.

This function shows every FRiday and Saturday as being selectable, but I need it to be every other.

beforeShowDay: function(date) {
        var day = date.getDay();
        return [(day > 4 && day < 7)];

My idea was to set a start point date and get the time span between the two dates, and then see if dividing by 14 days results in an integer, but I'm doing something wrong.  Please help.