diff --git a/core/modules/datetime/tests/src/Functional/DateTimeFieldTest.php b/core/modules/datetime/tests/src/Functional/DateTimeFieldTest.php
index ab03ff5..e6f8fcd 100644
--- a/core/modules/datetime/tests/src/Functional/DateTimeFieldTest.php
+++ b/core/modules/datetime/tests/src/Functional/DateTimeFieldTest.php
@@ -54,9 +54,9 @@ public function testDateField() {
       $this->assertFieldByXPath('//div[@id="edit-' . $field_name . '-0-value--description"]', NULL, 'ARIA description found');
 
       // Build up a date in the UTC timezone. Note that using this will also
-      // mimic the user in a different timezone simply entering '2012-12-31' via
+      // mimic the user in a different timezone simply entering '2018-02-15' via
       // the UI.
-      $value = '2012-12-31 00:00:00';
+      $value = '2018-02-15 00:00:00';
       $date = new DrupalDateTime($value, DATETIME_STORAGE_TIMEZONE);
 
       // Submit a valid date and ensure it is accepted.