diff --git a/core/themes/stable/templates/form/datetime-fieldset-wrapper.html.twig b/core/themes/stable/templates/form/datetime-fieldset-wrapper.html.twig
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+++ b/core/themes/stable/templates/form/datetime-fieldset-wrapper.html.twig
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+{#
+/**
+ * @file
+ * Default theme implementation of a datetime fieldset form wrapper.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the fieldset element.
+ * - required: The required marker or empty if the associated fieldset is
+ *   not required.
+ * - legend: The legend element containing the following properties:
+ *   - title: Title of the fieldset, intended for use as the text of the legend.
+ *   - attributes: HTML attributes to apply to the legend.
+ * - description: The description element containing the following properties:
+ *   - content: The description content of the fieldset.
+ *   - attributes: HTML attributes to apply to the description container.
+ * - content: The form element to be output.
+ *
+ * @see template_preprocess_datetime_fieldset_wrapper()
+ *
+ * @ingroup themeable
+ */
+#}
+<fieldset{{ attributes }}>
+  {% if legend.title is not empty or required -%}
+    {#  Always wrap fieldset legends in a SPAN for CSS positioning. #}
+    <legend{{ legend.attributes }}><span class="{{ legend_span.attributes.class }}">{{ legend.title }}{{ required }}</span></legend>
+  {%- endif %}
+  <div class="fieldset-wrapper">
+    {{ content }}
+    {% if description.content %}
+      <div{{ description.attributes }}>{{ description.content }}</div>
+    {% endif %}
+  </div>
+</fieldset>