class Date

1. 9.x drupal/core/lib/Drupal/Core/TypedData/Type/Date.php \Drupal\Core\TypedData\Type\Date
2. 9.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/field/Date.php \Drupal\views\Plugin\views\field\Date
3. 9.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php \Drupal\views\Plugin\views\argument\Date
4. 9.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/sort/Date.php \Drupal\views\Plugin\views\sort\Date
5. 9.x drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/Date.php \Drupal\views\Plugin\views\filter\Date

NcsLastUpdated.php in drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/filter/NcsLastUpdated.php

Definition of Drupal\comment\Plugin\views\filter\NcsLastUpdated.

Date::get_sort_name in drupal/core/modules/views/lib/Drupal/views/Plugin/views/argument/Date.php

Return a description of how the argument would normally be sorted.

dblog_event in drupal/core/modules/dblog/dblog.admin.inc

Page callback: Displays details about a specific database log message.

dblog_overview in drupal/core/modules/dblog/dblog.admin.inc

Page callback: Displays a listing of database log messages.

HttpCache::validate in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/HttpCache/HttpCache.php

Validates that a cache entry is fresh.

HttpCacheTest::testCachesResponsesWithAMaxAgeDirective in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/HttpCache/HttpCacheTest.php

... See full list

class Date extends Numeric {
  protected function defineOptions() {
    $options = parent::defineOptions();

    // value is already set up properly, we're just adding our new field to it.
    $options['value']['contains']['type']['default'] = 'date';
    return $options;
  }

  /**
   * Add a type selector to the value form
   */
  function value_form(&$form, &$form_state) {
    if (empty($form_state['exposed'])) {
      $form['value']['type'] = array(
        '#type' => 'radios',
        '#title' => t('Value type'),
        '#options' => array(
          'date' => t('A date in any machine readable format. CCYY-MM-DD HH:MM:SS is preferred.'),
          'offset' => t('An offset from the current time such as "!example1" or "!example2"', array(
            '!example1' => '+1 day',
            '!example2' => '-2 hours -30 minutes',
          )),
        ),
        '#default_value' => !empty($this->value['type']) ? $this->value['type'] : 'date',
      );
    }
    parent::value_form($form, $form_state);
  }
  public function validateOptionsForm(&$form, &$form_state) {
    parent::validateOptionsForm($form, $form_state);
    if (!empty($this->options['exposed']) && empty($form_state['values']['options']['expose']['required'])) {

      // Who cares what the value is if it's exposed and non-required.
      return;
    }
    $this
      ->validateValidTime($form['value'], $form_state['values']['options']['operator'], $form_state['values']['options']['value']);
  }
  public function validateExposed(&$form, &$form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }
    if (empty($this->options['expose']['required'])) {

      // Who cares what the value is if it's exposed and non-required.
      return;
    }
    $value =& $form_state['values'][$this->options['expose']['identifier']];
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $form_state['values'][$this->options['expose']['operator_id']];
    }
    else {
      $operator = $this->operator;
    }
    $this
      ->validateValidTime($this->options['expose']['identifier'], $operator, $value);
  }

  /**
   * Validate that the time values convert to something usable.
   */
  public function validateValidTime(&$form, $operator, $value) {
    $operators = $this
      ->operators();
    if ($operators[$operator]['values'] == 1) {
      $convert = strtotime($value['value']);
      if (!empty($form['value']) && ($convert == -1 || $convert === FALSE)) {
        form_error($form['value'], t('Invalid date format.'));
      }
    }
    elseif ($operators[$operator]['values'] == 2) {
      $min = strtotime($value['min']);
      if ($min == -1 || $min === FALSE) {
        form_error($form['min'], t('Invalid date format.'));
      }
      $max = strtotime($value['max']);
      if ($max == -1 || $max === FALSE) {
        form_error($form['max'], t('Invalid date format.'));
      }
    }
  }

  /**
   * Validate the build group options form.
   */
  function build_group_validate($form, &$form_state) {

    // Special case to validate grouped date filters, this is because the
    // $group['value'] array contains the type of filter (date or offset)
    // and therefore the number of items the comparission has to be done
    // against 'one' instead of 'zero'.
    foreach ($form_state['values']['options']['group_info']['group_items'] as $id => $group) {
      if (empty($group['remove'])) {

        // Check if the title is defined but value wasn't defined.
        if (!empty($group['title'])) {
          if (!is_array($group['value']) && empty($group['value']) || is_array($group['value']) && count(array_filter($group['value'])) == 1) {
            form_error($form['group_info']['group_items'][$id]['value'], t('The value is required if title for this item is defined.'));
          }
        }

        // Check if the value is defined but title wasn't defined.
        if (!is_array($group['value']) && !empty($group['value']) || is_array($group['value']) && count(array_filter($group['value'])) > 1) {
          if (empty($group['title'])) {
            form_error($form['group_info']['group_items'][$id]['title'], t('The title is required if value for this item is defined.'));
          }
        }
      }
    }
  }
  public function acceptExposedInput($input) {
    if (empty($this->options['exposed'])) {
      return TRUE;
    }

    // Store this because it will get overwritten.
    $type = $this->value['type'];
    $rc = parent::acceptExposedInput($input);

    // Don't filter if value(s) are empty.
    $operators = $this
      ->operators();
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $input[$this->options['expose']['operator_id']];
    }
    else {
      $operator = $this->operator;
    }
    if ($operators[$operator]['values'] == 1) {
      if ($this->value['value'] == '') {
        return FALSE;
      }
    }
    else {
      if ($this->value['min'] == '' || $this->value['max'] == '') {
        return FALSE;
      }
    }

    // restore what got overwritten by the parent.
    $this->value['type'] = $type;
    return $rc;
  }
  function op_between($field) {
    $a = intval(strtotime($this->value['min'], 0));
    $b = intval(strtotime($this->value['max'], 0));
    if ($this->value['type'] == 'offset') {
      $a = '***CURRENT_TIME***' . sprintf('%+d', $a);

      // keep sign
      $b = '***CURRENT_TIME***' . sprintf('%+d', $b);

      // keep sign
    }

    // This is safe because we are manually scrubbing the values.
    // It is necessary to do it this way because $a and $b are formulas when using an offset.
    $operator = strtoupper($this->operator);
    $this->query
      ->add_where_expression($this->options['group'], "{$field} {$operator} {$a} AND {$b}");
  }
  function op_simple($field) {
    $value = intval(strtotime($this->value['value'], 0));
    if (!empty($this->value['type']) && $this->value['type'] == 'offset') {
      $value = '***CURRENT_TIME***' . sprintf('%+d', $value);

      // keep sign
    }

    // This is safe because we are manually scrubbing the value.
    // It is necessary to do it this way because $value is a formula when using an offset.
    $this->query
      ->add_where_expression($this->options['group'], "{$field} {$this->operator} {$value}");
  }

}