named datetime formats

motion/ruby_motion_query/format.rb

@@ -24,7 +24,7 @@ module RubyMotionQuery
       #
       # See <http://www.unicode.org/reports/tr35/tr35-19.html#Date_Format_Patterns>
       # for more information about date format strings.
-      def date(date, *format_or_styles)
+      def date(date = nil, *format_or_styles)
         RubyMotionQuery::Format::Date.formatter(*format_or_styles).stringFromDate(date)
       end
 
@@ -35,6 +35,10 @@ module RubyMotionQuery
       def date_formatter(*format_or_styles)
         RubyMotionQuery::Format::Date.formatter(*format_or_styles)
       end
+
+      def add_datetime_style(style, format)
+        RubyMotionQuery::Format::Date.add_datetime_style(style, format)
+      end
     end
   end
 
@@ -120,6 +124,11 @@ module RubyMotionQuery
         end
       end
 
+      def add_datetime_style(style_name, format)
+        @_date_formatters ||= {}
+
+        @_date_formatters[[style_name].to_s] ||= formatter_from_format(format)
+      end
     end
   end
 end

spec/format.rb

@@ -73,4 +73,13 @@ describe 'format' do
     rmq.format.date(date, :medium_time, :short_date).should == '1/2/13, 12:15:30 PM'
   end
 
+  it "should associate formats with custom styles" do
+    date = Time.new(2013,1,2,12,15,30)
+
+    rmq.format.add_datetime_style(:mon_year, "MMM yyyy")
+    rmq.format.date_formatter(:mon_year).class.should == NSDateFormatter
+    rmq.format.date_formatter(:mon_year).stringFromDate(date).should == 'Jan 2013'
+    rmq.format.date(date, :mon_year).should == 'Jan 2013'
+  end
+
 end