don't allow 0 or > 12 for meridian am hour

lib/validates_timeliness/parser.rb

@@ -243,6 +243,8 @@ module ValidatesTimeliness
           values[0..2] = ValidatesTimeliness.dummy_date_for_time_type if type == :time
           return values
         end
+      rescue
+        nil
       end
 
       # Delete formats of specified type. Error raised if format not found.
@@ -289,6 +291,7 @@ module ValidatesTimeliness
         hour = hour.to_i
         return hour if meridian.nil?
         if meridian.delete('.').downcase == 'am'
+          raise if hour == 0 || hour > 12
           hour == 12 ? 0 : hour
         else
           hour == 12 ? hour : hour + 12

spec/validates_timeliness/parser_spec.rb

@@ -102,6 +102,13 @@ describe ValidatesTimeliness::Parser do
       time_array.should == [2000,1,1,12,13,14,0]
     end
 
+    it "should return nil if time hour is out of range for AM meridian" do
+      time_array = formats._parse('13:14 am', :time, :strict => true)
+      time_array.should == nil
+      time_array = formats._parse('00:14 am', :time, :strict => true)
+      time_array.should == nil
+    end
+
     it "should return date array from time string" do
       time_array = formats._parse('2000-02-01', :date, :strict => true)
       time_array.should == [2000,2,1,0,0,0,0]