Ruby's Time#yday should start from 1; close #581

src/time.c

@@ -395,7 +395,7 @@ mrb_time_yday(mrb_state *mrb, mrb_value self)
 
   tm = (struct mrb_time *)mrb_check_datatype(mrb, self, &mrb_time_type);
   if (!tm) return mrb_nil_value();
-  return mrb_fixnum_value(tm->datetime.tm_yday);
+  return mrb_fixnum_value(tm->datetime.tm_yday + 1);
 }
 
 /* 15.2.19.7.32 */

test/t/time.rb

@@ -177,7 +177,7 @@ if Object.const_defined?(:Time)
   end
 
   assert('Time#yday', '15.2.19.7.31') do
-    Time.gm(2012, 12, 23).yday == 357
+    Time.gm(2012, 12, 23).yday == 358
   end
 
   assert('Time#year', '15.2.19.7.32') do