jekyll plugin to format date

formatted_date.rb

module Jekyll::CustomFilter
    def formatted_date(date)
        # date = Time.parse(string_date)
        ending = 'th'
        case date.day % 10 
        when 1
            ending = 'st'
        when 2
            ending = 'nd'
        when 3
            ending = 'rd'
        end
        date.strftime("%B %-d#{ending}, %Y")
    end
end
  
Liquid::Template.register_filter(Jekyll::CustomFilter)