Correct date writing for consent_date

app/assets/javascripts/settings.js.erb

@@ -65,7 +65,7 @@ See doc/COPYRIGHT.rdoc for more details.
       });
 
       /* Javascript for user settings consent date */
-      $("#consent-date").datepicker();
+      $("#settings_consent_date").datepicker();
     });
 
     /** Toggle notification settings fields */

app/models/setting.rb

@@ -136,11 +136,24 @@ class Setting < ActiveRecord::Base
   end
 
   def value=(v)
-    if v && @@available_settings[name] && @@available_settings[name]['serialized']
-      v = v.to_yaml
+    write_attribute(:value, formatted_value(v))
   end
 
-    write_attribute(:value, v.to_s)
+  def formatted_value(value)
+    return value unless value.present?
+
+    default = @@available_settings[name]
+
+    if default['serialized']
+      return value.to_yaml
+    end
+
+    case default['format']
+    when "datetime"
+      value.iso8601
+    else
+      value.to_s
+    end
   end
 
   # Returns the value of the setting named name

app/views/settings/_users.html.erb

@@ -49,7 +49,7 @@ See doc/COPYRIGHT.rdoc for more details.
       <div class="form--field">
         <%= setting_block("consent_date") do %>
           <span class="form--text-field-container -slim">
-            <input type="text" id="consent-date">
+            <input type="text" name="settings[consent_date]" id="settings_consent_date">
           </span>
         <% end %>
         <div class="form--field-instructions">