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class DateTimePlus in Drupal 9

Same name and namespace in other branches
  1. 8 core/lib/Drupal/Component/Datetime/DateTimePlus.php \Drupal\Component\Datetime\DateTimePlus

Wraps DateTime().

This class wraps the PHP DateTime class with more flexible initialization parameters, allowing a date to be created from an existing date object, a timestamp, a string with an unknown format, a string with a known format, or an array of date parts. It also adds an errors array and a __toString() method to the date object.

This class is less lenient than the DateTime class. It changes the default behavior for handling date values like '2011-00-00'. The DateTime class would convert that value to '2010-11-30' and report a warning but not an error. This extension treats that as an error.

As with the DateTime class, a date object may be created even if it has errors. It has an errors array attached to it that explains what the errors are. This is less disruptive than allowing datetime exceptions to abort processing. The calling script can decide what to do about errors using hasErrors() and getErrors().

@method $this add(\DateInterval $interval) @method static array getLastErrors() @method $this modify(string $modify) @method $this setDate(int $year, int $month, int $day) @method $this setISODate(int $year, int $week, int $day = 1) @method $this setTime(int $hour, int $minute, int $second = 0, int $microseconds = 0) @method $this setTimestamp(int $unixtimestamp) @method $this setTimezone(\DateTimeZone $timezone) @method $this sub(\DateInterval $interval) @method int getOffset() @method int getTimestamp() @method \DateTimeZone getTimezone()

Hierarchy

Expanded class hierarchy of DateTimePlus

11 files declare their use of DateTimePlus
AggregatorTestRssController.php in core/modules/aggregator/tests/modules/aggregator_test/src/Controller/AggregatorTestRssController.php
Date.php in core/modules/datetime/src/Plugin/views/filter/Date.php
DateTimeFormatConstraintValidator.php in core/modules/datetime/src/Plugin/Validation/Constraint/DateTimeFormatConstraintValidator.php
DateTimeHandlerTestBase.php in core/modules/datetime/tests/src/Kernel/Views/DateTimeHandlerTestBase.php
DateTimePlusTest.php in core/tests/Drupal/Tests/Component/Datetime/DateTimePlusTest.php

... See full list

File

core/lib/Drupal/Component/Datetime/DateTimePlus.php, line 40

Namespace

Drupal\Component\Datetime
View source 
class DateTimePlus {
  use ToStringTrait;
  const FORMAT = 'Y-m-d H:i:s';

  /**
   * A RFC7231 Compliant date.
   *
   * @see http://tools.ietf.org/html/rfc7231#section-7.1.1.1
   *
   * Example: Sun, 06 Nov 1994 08:49:37 GMT
   */
  const RFC7231 = 'D, d M Y H:i:s \\G\\M\\T';

  /**
   * An array of possible date parts.
   */
  protected static $dateParts = [
    'year',
    'month',
    'day',
    'hour',
    'minute',
    'second',
  ];

  /**
   * The value of the time value passed to the constructor.
   *
   * @var string
   */
  protected $inputTimeRaw = '';

  /**
   * The prepared time, without timezone, for this date.
   *
   * @var string
   */
  protected $inputTimeAdjusted = '';

  /**
   * The value of the timezone passed to the constructor.
   *
   * @var string
   */
  protected $inputTimeZoneRaw = '';

  /**
   * The prepared timezone object used to construct this date.
   *
   * @var string
   */
  protected $inputTimeZoneAdjusted = '';

  /**
   * The value of the format passed to the constructor.
   *
   * @var string
   */
  protected $inputFormatRaw = '';

  /**
   * The prepared format, if provided.
   *
   * @var string
   */
  protected $inputFormatAdjusted = '';

  /**
   * The value of the language code passed to the constructor.
   */
  protected $langcode = NULL;

  /**
   * An array of errors encountered when creating this date.
   */
  protected $errors = [];

  /**
   * The DateTime object.
   *
   * @var \DateTime
   */
  protected $dateTimeObject = NULL;

  /**
   * Creates a date object from an input date object.
   *
   * @param \DateTime $datetime
   *   A DateTime object.
   * @param array $settings
   *   (optional) A keyed array for settings, suitable for passing on to
   *   __construct().
   *
   * @return static
   *   A new DateTimePlus object.
   */
  public static function createFromDateTime(\DateTime $datetime, $settings = []) {
    return new static($datetime
      ->format(static::FORMAT), $datetime
      ->getTimezone(), $settings);
  }

  /**
   * Creates a date object from an array of date parts.
   *
   * Converts the input value into an ISO date, forcing a full ISO
   * date even if some values are missing.
   *
   * @param array $date_parts
   *   An array of date parts, like ('year' => 2014, 'month' => 4).
   * @param mixed $timezone
   *   (optional) \DateTimeZone object, time zone string or NULL. NULL uses the
   *   default system time zone. Defaults to NULL.
   * @param array $settings
   *   (optional) A keyed array for settings, suitable for passing on to
   *   __construct().
   *
   * @return static
   *   A new DateTimePlus object.
   *
   * @throws \InvalidArgumentException
   *   If the array date values or value combination is not correct.
   */
  public static function createFromArray(array $date_parts, $timezone = NULL, $settings = []) {
    $date_parts = static::prepareArray($date_parts, TRUE);
    if (static::checkArray($date_parts)) {

      // Even with validation, we can end up with a value that the
      // DateTime class won't handle, like a year outside the range
      // of -9999 to 9999, which will pass checkdate() but
      // fail to construct a date object.
      $iso_date = static::arrayToISO($date_parts);
      return new static($iso_date, $timezone, $settings);
    }
    else {
      throw new \InvalidArgumentException('The array contains invalid values.');
    }
  }

  /**
   * Creates a date object from timestamp input.
   *
   * The timezone of a timestamp is always UTC. The timezone for a
   * timestamp indicates the timezone used by the format() method.
   *
   * @param int $timestamp
   *   A UNIX timestamp.
   * @param mixed $timezone
   *   (optional) \DateTimeZone object, time zone string or NULL. See
   *   __construct() for more details.
   * @param array $settings
   *   (optional) A keyed array for settings, suitable for passing on to
   *   __construct().
   *
   * @return static
   *   A new DateTimePlus object.
   *
   * @throws \InvalidArgumentException
   *   If the timestamp is not numeric.
   */
  public static function createFromTimestamp($timestamp, $timezone = NULL, $settings = []) {
    if (!is_numeric($timestamp)) {
      throw new \InvalidArgumentException('The timestamp must be numeric.');
    }
    $datetime = new static('', $timezone, $settings);
    $datetime
      ->setTimestamp($timestamp);
    return $datetime;
  }

  /**
   * Creates a date object from an input format.
   *
   * @param string $format
   *   PHP date() type format for parsing the input. This is recommended
   *   to use things like negative years, which php's parser fails on, or
   *   any other specialized input with a known format. If provided the
   *   date will be created using the createFromFormat() method.
   *   @see http://php.net/manual/datetime.createfromformat.php
   * @param string $time
   *   String representing the time.
   * @param mixed $timezone
   *   (optional) \DateTimeZone object, time zone string or NULL. See
   *   __construct() for more details.
   * @param array $settings
   *   (optional) A keyed array for settings, suitable for passing on to
   *   __construct(). Supports an additional key:
   *   - validate_format: (optional) Boolean choice to validate the
   *     created date using the input format. The format used in
   *     createFromFormat() allows slightly different values than format().
   *     Using an input format that works in both functions makes it
   *     possible to a validation step to confirm that the date created
   *     from a format string exactly matches the input. This option
   *     indicates the format can be used for validation. Defaults to TRUE.
   *
   * @return static
   *   A new DateTimePlus object.
   *
   * @throws \InvalidArgumentException
   *   If the a date cannot be created from the given format.
   * @throws \UnexpectedValueException
   *   If the created date does not match the input value.
   */
  public static function createFromFormat($format, $time, $timezone = NULL, $settings = []) {
    if (!isset($settings['validate_format'])) {
      $settings['validate_format'] = TRUE;
    }

    // Tries to create a date from the format and use it if possible.
    // A regular try/catch won't work right here, if the value is
    // invalid it doesn't return an exception.
    $datetimeplus = new static('', $timezone, $settings);
    $date = \DateTime::createFromFormat($format, $time, $datetimeplus
      ->getTimezone());
    if (!$date instanceof \DateTime) {
      throw new \InvalidArgumentException('The date cannot be created from a format.');
    }
    else {
      $datetimeplus
        ->setTimestamp($date
        ->getTimestamp());
      $datetimeplus
        ->setTimezone($date
        ->getTimezone());

      // Functions that parse date is forgiving, it might create a date that
      // is not exactly a match for the provided value, so test for that by
      // re-creating the date/time formatted string and comparing it to the input. For
      // instance, an input value of '11' using a format of Y (4 digits) gets
      // created as '0011' instead of '2011'.
      if ($settings['validate_format'] && $date
        ->format($format) != $time) {
        throw new \UnexpectedValueException('The created date does not match the input value.');
      }
    }
    return $datetimeplus;
  }

  /**
   * Constructs a date object set to a requested date and timezone.
   *
   * @param string $time
   *   (optional) A date/time string. Defaults to 'now'.
   * @param mixed $timezone
   *   (optional) \DateTimeZone object, time zone string or NULL. NULL uses the
   *   default system time zone. Defaults to NULL. Note that the $timezone
   *   parameter and the current timezone are ignored when the $time parameter
   *   either is a UNIX timestamp (e.g. @946684800) or specifies a timezone
   *   (e.g. 2010-01-28T15:00:00+02:00).
   *   @see http://php.net/manual/datetime.construct.php
   * @param array $settings
   *   (optional) Keyed array of settings. Defaults to empty array.
   *   - langcode: (optional) String two letter language code used to control
   *     the result of the format(). Defaults to NULL.
   *   - debug: (optional) Boolean choice to leave debug values in the
   *     date object for debugging purposes. Defaults to FALSE.
   */
  public function __construct($time = 'now', $timezone = NULL, $settings = []) {

    // Unpack settings.
    $this->langcode = !empty($settings['langcode']) ? $settings['langcode'] : NULL;

    // Massage the input values as necessary.
    $prepared_time = $this
      ->prepareTime($time);
    $prepared_timezone = $this
      ->prepareTimezone($timezone);
    try {
      $this->errors = [];
      if (!empty($prepared_time)) {
        $test = date_parse($prepared_time);
        if (!empty($test['errors'])) {
          $this->errors = $test['errors'];
        }
      }
      if (empty($this->errors)) {
        $this->dateTimeObject = new \DateTime($prepared_time, $prepared_timezone);
      }
    } catch (\Exception $e) {
      $this->errors[] = $e
        ->getMessage();
    }

    // Clean up the error messages.
    $this
      ->checkErrors();
  }

  /**
   * Renders the timezone name.
   *
   * @return string
   */
  public function render() {
    return $this
      ->format(static::FORMAT) . ' ' . $this
      ->getTimeZone()
      ->getName();
  }

  /**
   * Implements the magic __call method.
   *
   * Passes through all unknown calls onto the DateTime object.
   *
   * @param string $method
   *   The method to call on the decorated object.
   * @param array $args
   *   Call arguments.
   *
   * @return mixed
   *   The return value from the method on the decorated object. If the proxied
   *   method call returns a DateTime object, then return the original
   *   DateTimePlus object, which allows function chaining to work properly.
   *   Otherwise, the value from the proxied method call is returned.
   *
   * @throws \Exception
   *   Thrown when the DateTime object is not set.
   * @throws \BadMethodCallException
   *   Thrown when there is no corresponding method on the DateTime object to
   *   call.
   */
  public function __call($method, array $args) {

    // @todo consider using assert() as per https://www.drupal.org/node/2451793.
    if (!isset($this->dateTimeObject)) {
      throw new \Exception('DateTime object not set.');
    }
    if (!method_exists($this->dateTimeObject, $method)) {
      throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s()', static::class, $method));
    }
    $result = call_user_func_array([
      $this->dateTimeObject,
      $method,
    ], $args);
    return $result === $this->dateTimeObject ? $this : $result;
  }

  /**
   * Returns the difference between two DateTimePlus objects.
   *
   * @param \Drupal\Component\Datetime\DateTimePlus|\DateTime $datetime2
   *   The date to compare to.
   * @param bool $absolute
   *   Should the interval be forced to be positive?
   *
   * @return \DateInterval
   *   A DateInterval object representing the difference between the two dates.
   *
   * @throws \BadMethodCallException
   *    If the input isn't a DateTime or DateTimePlus object.
   */
  public function diff($datetime2, $absolute = FALSE) {
    if ($datetime2 instanceof DateTimePlus) {
      $datetime2 = $datetime2->dateTimeObject;
    }
    if (!$datetime2 instanceof \DateTime) {
      throw new \BadMethodCallException(sprintf('Method %s expects parameter 1 to be a \\DateTime or \\Drupal\\Component\\Datetime\\DateTimePlus object', __METHOD__));
    }
    return $this->dateTimeObject
      ->diff($datetime2, $absolute);
  }

  /**
   * Implements the magic __callStatic method.
   *
   * Passes through all unknown static calls onto the DateTime object.
   */
  public static function __callStatic($method, $args) {
    if (!method_exists('\\DateTime', $method)) {
      throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s()', static::class, $method));
    }
    return call_user_func_array([
      '\\DateTime',
      $method,
    ], $args);
  }

  /**
   * Implements the magic __clone method.
   *
   * Deep-clones the DateTime object we're wrapping.
   */
  public function __clone() {
    $this->dateTimeObject = clone $this->dateTimeObject;
  }

  /**
   * Prepares the input time value.
   *
   * Changes the input value before trying to use it, if necessary.
   * Can be overridden to handle special cases.
   *
   * @param mixed $time
   *   An input value, which could be a timestamp, a string,
   *   or an array of date parts.
   *
   * @return mixed
   *   The massaged time.
   */
  protected function prepareTime($time) {
    return $time;
  }

  /**
   * Prepares the input timezone value.
   *
   * Changes the timezone before trying to use it, if necessary.
   * Most importantly, makes sure there is a valid timezone
   * object before moving further.
   *
   * @param mixed $timezone
   *   Either a timezone name or a timezone object or NULL.
   *
   * @return \DateTimeZone
   *   The massaged time zone.
   */
  protected function prepareTimezone($timezone) {

    // If the input timezone is a valid timezone object, use it.
    if ($timezone instanceof \DateTimezone) {
      $timezone_adjusted = $timezone;
    }
    elseif (!empty($timezone) && is_string($timezone)) {
      $timezone_adjusted = new \DateTimeZone($timezone);
    }

    // Default to the system timezone when not explicitly provided.
    // If the system timezone is missing, use 'UTC'.
    if (empty($timezone_adjusted) || !$timezone_adjusted instanceof \DateTimezone) {
      $system_timezone = date_default_timezone_get();
      $timezone_name = !empty($system_timezone) ? $system_timezone : 'UTC';
      $timezone_adjusted = new \DateTimeZone($timezone_name);
    }

    // We are finally certain that we have a usable timezone.
    return $timezone_adjusted;
  }

  /**
   * Prepares the input format value.
   *
   * Changes the input format before trying to use it, if necessary.
   * Can be overridden to handle special cases.
   *
   * @param string $format
   *   A PHP format string.
   *
   * @return string
   *   The massaged PHP format string.
   */
  protected function prepareFormat($format) {
    return $format;
  }

  /**
   * Examines getLastErrors() to see what errors to report.
   *
   * Two kinds of errors are important: anything that DateTime
   * considers an error, and also a warning that the date was invalid.
   * PHP creates a valid date from invalid data with only a warning,
   * 2011-02-30 becomes 2011-03-03, for instance, but we don't want that.
   *
   * @see http://php.net/manual/time.getlasterrors.php
   */
  public function checkErrors() {
    $errors = \DateTime::getLastErrors();
    if (!empty($errors['errors'])) {
      $this->errors = array_merge($this->errors, $errors['errors']);
    }

    // Most warnings are messages that the date could not be parsed
    // which causes it to be altered. For validation purposes, a warning
    // as bad as an error, because it means the constructed date does
    // not match the input value.
    if (!empty($errors['warnings'])) {
      $this->errors[] = 'The date is invalid.';
    }
    $this->errors = array_values(array_unique($this->errors));
  }

  /**
   * Detects if there were errors in the processing of this date.
   *
   * @return bool
   *   TRUE if there were errors in the processing of this date, FALSE
   *   otherwise.
   */
  public function hasErrors() {
    return (bool) count($this->errors);
  }

  /**
   * Gets error messages.
   *
   * Public function to return the error messages.
   *
   * @return array
   *   An array of errors encountered when creating this date.
   */
  public function getErrors() {
    return $this->errors;
  }

  /**
   * Creates an ISO date from an array of values.
   *
   * @param array $array
   *   An array of date values keyed by date part.
   * @param bool $force_valid_date
   *   (optional) Whether to force a full date by filling in missing
   *   values. Defaults to FALSE.
   *
   * @return string
   *   The date as an ISO string.
   */
  public static function arrayToISO($array, $force_valid_date = FALSE) {
    $array = static::prepareArray($array, $force_valid_date);
    $input_time = '';
    if ($array['year'] !== '') {
      $input_time = static::datePad(intval($array['year']), 4);
      if ($force_valid_date || $array['month'] !== '') {
        $input_time .= '-' . static::datePad(intval($array['month']));
        if ($force_valid_date || $array['day'] !== '') {
          $input_time .= '-' . static::datePad(intval($array['day']));
        }
      }
    }
    if ($array['hour'] !== '') {
      $input_time .= $input_time ? 'T' : '';
      $input_time .= static::datePad(intval($array['hour']));
      if ($force_valid_date || $array['minute'] !== '') {
        $input_time .= ':' . static::datePad(intval($array['minute']));
        if ($force_valid_date || $array['second'] !== '') {
          $input_time .= ':' . static::datePad(intval($array['second']));
        }
      }
    }
    return $input_time;
  }

  /**
   * Creates a complete array from a possibly incomplete array of date parts.
   *
   * @param array $array
   *   An array of date values keyed by date part.
   * @param bool $force_valid_date
   *   (optional) Whether to force a valid date by filling in missing
   *   values with valid values or just to use empty values instead.
   *   Defaults to FALSE.
   *
   * @return array
   *   A complete array of date parts.
   */
  public static function prepareArray($array, $force_valid_date = FALSE) {
    if ($force_valid_date) {
      $now = new \DateTime();
      $array += [
        'year' => $now
          ->format('Y'),
        'month' => 1,
        'day' => 1,
        'hour' => 0,
        'minute' => 0,
        'second' => 0,
      ];
    }
    else {
      $array += [
        'year' => '',
        'month' => '',
        'day' => '',
        'hour' => '',
        'minute' => '',
        'second' => '',
      ];
    }
    return $array;
  }

  /**
   * Checks that arrays of date parts will create a valid date.
   *
   * Checks that an array of date parts has a year, month, and day,
   * and that those values create a valid date. If time is provided,
   * verifies that the time values are valid. Sort of an
   * equivalent to checkdate().
   *
   * @param array $array
   *   An array of datetime values keyed by date part.
   *
   * @return bool
   *   TRUE if the datetime parts contain valid values, otherwise FALSE.
   */
  public static function checkArray($array) {
    $valid_date = FALSE;
    $valid_time = TRUE;

    // Check for a valid date using checkdate(). Only values that
    // 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.
    foreach ([
      'hour',
      'minute',
      'second',
    ] as $key) {
      if (array_key_exists($key, $array)) {
        $value = $array[$key];
        switch ($key) {
          case 'hour':
            if (!preg_match('/^([1-2][0-3]|[01]?[0-9])$/', $value)) {
              $valid_time = FALSE;
            }
            break;
          case 'minute':
          case 'second':
          default:
            if (!preg_match('/^([0-5][0-9]|[0-9])$/', $value)) {
              $valid_time = FALSE;
            }
            break;
        }
      }
    }
    return $valid_date && $valid_time;
  }

  /**
   * Pads date parts with zeros.
   *
   * Helper function for a task that is often required when working with dates.
   *
   * @param int $value
   *   The value to pad.
   * @param int $size
   *   (optional) Size expected, usually 2 or 4. Defaults to 2.
   *
   * @return string
   *   The padded value.
   */
  public static function datePad($value, $size = 2) {
    return sprintf("%0" . $size . "d", $value);
  }

  /**
   * Formats the date for display.
   *
   * @param string $format
   *   Format accepted by date().
   * @param array $settings
   *   - timezone: (optional) String timezone name. Defaults to the timezone
   *     of the date object.
   *
   * @return string|null
   *   The formatted value of the date or NULL if there were construction
   *   errors.
   */
  public function format($format, $settings = []) {

    // If there were construction errors, we can't format the date.
    if ($this
      ->hasErrors()) {
      return;
    }

    // Format the date and catch errors.
    try {

      // Clone the date/time object so we can change the time zone without
      // disturbing the value stored in the object.
      $dateTimeObject = clone $this->dateTimeObject;
      if (isset($settings['timezone'])) {
        $dateTimeObject
          ->setTimezone(new \DateTimeZone($settings['timezone']));
      }
      $value = $dateTimeObject
        ->format($format);
    } catch (\Exception $e) {
      $this->errors[] = $e
        ->getMessage();
    }
    return $value;
  }

  /**
   * Sets the default time for an object built from date-only data.
   *
   * The default time for a date without time can be anything, so long as it is
   * consistently applied. If we use noon, dates in most timezones will have the
   * same value for in both the local timezone and UTC.
   */
  public function setDefaultDateTime() {
    $this->dateTimeObject
      ->setTime(12, 0, 0);
  }

  /**
   * Gets a clone of the proxied PHP \DateTime object wrapped by this class.
   *
   * @return \DateTime
   *   A clone of the wrapped PHP \DateTime object.
   */
  public function getPhpDateTime() {
    return clone $this->dateTimeObject;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DateTimePlus::$dateParts protected static property An array of possible date parts.
DateTimePlus::$dateTimeObject protected property The DateTime object.
DateTimePlus::$errors protected property An array of errors encountered when creating this date.
DateTimePlus::$inputFormatAdjusted protected property The prepared format, if provided.
DateTimePlus::$inputFormatRaw protected property The value of the format passed to the constructor.
DateTimePlus::$inputTimeAdjusted protected property The prepared time, without timezone, for this date.
DateTimePlus::$inputTimeRaw protected property The value of the time value passed to the constructor.
DateTimePlus::$inputTimeZoneAdjusted protected property The prepared timezone object used to construct this date.
DateTimePlus::$inputTimeZoneRaw protected property The value of the timezone passed to the constructor.
DateTimePlus::$langcode protected property The value of the language code passed to the constructor.
DateTimePlus::arrayToISO public static function Creates an ISO date from an array of values.
DateTimePlus::checkArray public static function Checks that arrays of date parts will create a valid date.
DateTimePlus::checkErrors public function Examines getLastErrors() to see what errors to report.
DateTimePlus::createFromArray public static function Creates a date object from an array of date parts.
DateTimePlus::createFromDateTime public static function Creates a date object from an input date object.
DateTimePlus::createFromFormat public static function Creates a date object from an input format.
DateTimePlus::createFromTimestamp public static function Creates a date object from timestamp input.
DateTimePlus::datePad public static function Pads date parts with zeros.
DateTimePlus::diff public function Returns the difference between two DateTimePlus objects.
DateTimePlus::format public function Formats the date for display. 1
DateTimePlus::FORMAT constant
DateTimePlus::getErrors public function Gets error messages.
DateTimePlus::getPhpDateTime public function Gets a clone of the proxied PHP \DateTime object wrapped by this class.
DateTimePlus::hasErrors public function Detects if there were errors in the processing of this date.
DateTimePlus::prepareArray public static function Creates a complete array from a possibly incomplete array of date parts.
DateTimePlus::prepareFormat protected function Prepares the input format value.
DateTimePlus::prepareTime protected function Prepares the input time value.
DateTimePlus::prepareTimezone protected function Prepares the input timezone value. 1
DateTimePlus::render public function Renders the timezone name. Overrides ToStringTrait::render
DateTimePlus::RFC7231 constant A RFC7231 Compliant date.
DateTimePlus::setDefaultDateTime public function Sets the default time for an object built from date-only data.
DateTimePlus::__call public function Implements the magic __call method.
DateTimePlus::__callStatic public static function Implements the magic __callStatic method.
DateTimePlus::__clone public function Implements the magic __clone method.
DateTimePlus::__construct public function Constructs a date object set to a requested date and timezone. 1
ToStringTrait::_die protected function For test purposes, wrap die() in an overridable method.
ToStringTrait::__toString public function Implements the magic __toString() method.