we can visit DateTime

lib/arel/visitors/to_sql.rb

@@ -168,6 +168,7 @@ def visit_String o; quote(o) end
       def visit_Symbol o; quote(o) end
       def visit_Time o; quote(o) end
       def visit_Date o; quote(o) end
+      def visit_DateTime o; quote(o) end
       def visit_Float o; quote(o) end
       def visit_BigDecimal o; quote(o) end
 

spec/arel/visitors/to_sql_spec.rb

@@ -8,6 +8,10 @@ module Visitors
         @attr = Table.new(:users)[:id]
       end
 
+      it "should visit_DateTime" do
+        @visitor.accept DateTime.now
+      end
+
       it "should visit_Float" do
         @visitor.accept 2.14
       end