Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/themes/classy/templates/field/field--node--created.html.twig

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+{#
+/**
+ * @file
+ * Theme override for the node created field.
+ *
+ * This is an override of field.html.twig for the node created field. See that
+ * template for documentation about its details and overrides.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing span element.
+ * - items: List of all the field items. Each item contains:
+ *   - attributes: List of HTML attributes for each item.
+ *   - content: The field item content.
+ * - entity_type: The entity type to which the field belongs.
+ * - field_name: The name of the field.
+ * - field_type: The type of the field.
+ * - label_display: The display settings for the label.
+ *
+ * @see field.html.twig
+ */
+#}
+{% set field_name_class = field_name|clean_class %}
+{%
+  set classes = [
+    'field',
+    'field-' ~ entity_type|clean_class ~ '--' ~ field_name_class,
+    'field-name-' ~ field_name_class,
+    'field-type-' ~ field_type|clean_class,
+    'field-label-' ~ label_display,
+  ]
+%}
+<span{{ attributes.addClass(classes) }}>
+  {%- for item in items -%}
+    {{ item.content }}
+  {%- endfor -%}
+</span>