Issue #3156878 by alexpott, andypost: \Drupal\Component\Datetime\DateTimePlus should pass correct parameter types to checkdate()

core/lib/Drupal/Component/Datetime/DateTimePlus.php

@@ -624,11 +624,10 @@ class DateTimePlus {
     $valid_date = FALSE;
     $valid_time = TRUE;
     // Check for a valid date using checkdate(). Only values that
-    // meet that test are valid.
-    if (array_key_exists('year', $array) && array_key_exists('month', $array) && array_key_exists('day', $array)) {
-      if (@checkdate($array['month'], $array['day'], $array['year'])) {
-        $valid_date = TRUE;
-      }
+    // meet that test are valid. An empty value, either a string or a 0, is not
+    // a valid value.
+    if (!empty($array['year']) && !empty($array['month']) && !empty($array['day'])) {
+      $valid_date = checkdate($array['month'], $array['day'], $array['year']);
     }
     // Testing for valid time is reversed. Missing time is OK,
     // but incorrect values are not.

core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php

@@ -112,6 +112,23 @@ class DateTimePlusTest extends TestCase {
     );
   }
 
+  /**
+   * Tests DateTimePlus::checkArray().
+   *
+   * @param mixed $array
+   *   Input argument for DateTimePlus::checkArray().
+   * @param bool $expected
+   *   The expected result of DateTimePlus::checkArray().
+   *
+   * @dataProvider providerTestCheckArray
+   */
+  public function testCheckArray(array $array, $expected) {
+    $this->assertSame(
+      $expected,
+      DateTimePlus::checkArray($array)
+    );
+  }
+
   /**
    * Test creating dates from timestamps, and manipulating timezones.
    *
@@ -442,6 +459,30 @@ class DateTimePlusTest extends TestCase {
     ];
   }
 
+  /**
+   * Data provider for testCheckArray.
+   *
+   * @return array
+   *   An array of arrays, each containing:
+   *   - 'array' - Input for DateTimePlus::checkArray().
+   *   - 'expected' - Expected output for  DateTimePlus::checkArray().
+   *
+   * @see testCheckArray
+   */
+  public function providerTestCheckArray() {
+    return [
+      'Date array, date only' => [['year' => 2010, 'month' => 2, 'day' => 28], TRUE],
+      'Date array with hour' => [['year' => 2010, 'month' => 2, 'day' => 28, 'hour' => 10], TRUE],
+      'One year larger than the documented upper limit of checkdate()' => [['year' => 32768, 'month' => 1, 'day' => 8, 'hour' => 8, 'minute' => 0, 'second' => 0], FALSE],
+      'One year smaller than the documented lower limit of checkdate()' => [['year' => 0, 'month' => 1, 'day' => 8, 'hour' => 8, 'minute' => 0, 'second' => 0], FALSE],
+      'Invalid month from date array' => [['year' => 2010, 'month' => 27, 'day' => 8, 'hour' => 8, 'minute' => 0, 'second' => 0], FALSE],
+      'Invalid hour from date array' => [['year' => 2010, 'month' => 2, 'day' => 28, 'hour' => 80, 'minute' => 0, 'second' => 0], FALSE],
+      'Invalid minute from date array.' => [['year' => 2010, 'month' => 7, 'day' => 8, 'hour' => 8, 'minute' => 88, 'second' => 0], FALSE],
+      'Missing day' => [['year' => 2059, 'month' => 1, 'second' => 1], FALSE],
+      'Zero day' => [['year' => 2059, 'month' => 1, 'day' => 0], FALSE],
+    ];
+  }
+
   /**
    * Provides data for testDateTimezone.
    *