class DateHelper in Drupal 8

Defines Gregorian Calendar date values.

Lots of helpful functions for use in massaging dates, specific to the Gregorian calendar system. The values include both translated and untranslated values.

Untranslated values are useful as array keys and as css identifiers, and should be listed in English.

Translated values are useful for display to the user. All values that need translation should be hard-coded and wrapped in t() so the translation system will be able to process them.

Hierarchy

• class \Drupal\Core\Datetime\DateHelper

2 files declare their use of DateHelper

DateHelperTest.php in core/tests/Drupal/Tests/Core/Datetime/DateHelperTest.php

Datelist.php in core/lib/Drupal/Core/Datetime/Element/Datelist.php

File

core/lib/Drupal/Core/Datetime/DateHelper.php, line 19

Namespace

Drupal\Core\Datetime

class DateHelper {

  /**
   * Constructs an untranslated array of month names.
   *
   * @return array
   *   An array of month names.
   */
  public static function monthNamesUntranslated() {

    // Force the key to use the correct month value, rather than
    // starting with zero.
    return [
      1 => 'January',
      2 => 'February',
      3 => 'March',
      4 => 'April',
      5 => 'May',
      6 => 'June',
      7 => 'July',
      8 => 'August',
      9 => 'September',
      10 => 'October',
      11 => 'November',
      12 => 'December',
    ];
  }

  /**
   * Constructs an untranslated array of abbreviated month names.
   *
   * @return array
   *   An array of month names.
   */
  public static function monthNamesAbbrUntranslated() {

    // Force the key to use the correct month value, rather than
    // starting with zero.
    return [
      1 => 'Jan',
      2 => 'Feb',
      3 => 'Mar',
      4 => 'Apr',
      5 => 'May',
      6 => 'Jun',
      7 => 'Jul',
      8 => 'Aug',
      9 => 'Sep',
      10 => 'Oct',
      11 => 'Nov',
      12 => 'Dec',
    ];
  }

  /**
   * Returns a translated array of month names.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of month names.
   */
  public static function monthNames($required = FALSE) {

    // Force the key to use the correct month value, rather than
    // starting with zero.
    $monthnames = [
      1 => t('January', [], [
        'context' => 'Long month name',
      ]),
      2 => t('February', [], [
        'context' => 'Long month name',
      ]),
      3 => t('March', [], [
        'context' => 'Long month name',
      ]),
      4 => t('April', [], [
        'context' => 'Long month name',
      ]),
      5 => t('May', [], [
        'context' => 'Long month name',
      ]),
      6 => t('June', [], [
        'context' => 'Long month name',
      ]),
      7 => t('July', [], [
        'context' => 'Long month name',
      ]),
      8 => t('August', [], [
        'context' => 'Long month name',
      ]),
      9 => t('September', [], [
        'context' => 'Long month name',
      ]),
      10 => t('October', [], [
        'context' => 'Long month name',
      ]),
      11 => t('November', [], [
        'context' => 'Long month name',
      ]),
      12 => t('December', [], [
        'context' => 'Long month name',
      ]),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $monthnames : $monthnames;
  }

  /**
   * Constructs a translated array of month name abbreviations
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of month abbreviations.
   */
  public static function monthNamesAbbr($required = FALSE) {

    // Force the key to use the correct month value, rather than
    // starting with zero.
    $monthnames = [
      1 => t('Jan', [], [
        'context' => 'Abbreviated month name',
      ]),
      2 => t('Feb', [], [
        'context' => 'Abbreviated month name',
      ]),
      3 => t('Mar', [], [
        'context' => 'Abbreviated month name',
      ]),
      4 => t('Apr', [], [
        'context' => 'Abbreviated month name',
      ]),
      5 => t('May', [], [
        'context' => 'Abbreviated month name',
      ]),
      6 => t('Jun', [], [
        'context' => 'Abbreviated month name',
      ]),
      7 => t('Jul', [], [
        'context' => 'Abbreviated month name',
      ]),
      8 => t('Aug', [], [
        'context' => 'Abbreviated month name',
      ]),
      9 => t('Sep', [], [
        'context' => 'Abbreviated month name',
      ]),
      10 => t('Oct', [], [
        'context' => 'Abbreviated month name',
      ]),
      11 => t('Nov', [], [
        'context' => 'Abbreviated month name',
      ]),
      12 => t('Dec', [], [
        'context' => 'Abbreviated month name',
      ]),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $monthnames : $monthnames;
  }

  /**
   * Constructs an untranslated array of week days.
   *
   * @return array
   *   An array of week day names
   */
  public static function weekDaysUntranslated() {
    return [
      'Sunday',
      'Monday',
      'Tuesday',
      'Wednesday',
      'Thursday',
      'Friday',
      'Saturday',
    ];
  }

  /**
   * Returns a translated array of week names.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of week day names
   */
  public static function weekDays($required = FALSE) {
    $weekdays = [
      t('Sunday'),
      t('Monday'),
      t('Tuesday'),
      t('Wednesday'),
      t('Thursday'),
      t('Friday'),
      t('Saturday'),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $weekdays : $weekdays;
  }

  /**
   * Constructs a translated array of week day abbreviations.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of week day abbreviations
   */
  public static function weekDaysAbbr($required = FALSE) {
    $weekdays = [
      t('Sun', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Mon', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Tue', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Wed', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Thu', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Fri', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Sat', [], [
        'context' => 'Abbreviated weekday',
      ]),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $weekdays : $weekdays;
  }

  /**
   * Constructs a translated array of 2-letter week day abbreviations.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of week day 2 letter abbreviations
   */
  public static function weekDaysAbbr2($required = FALSE) {
    $weekdays = [
      t('Su', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Mo', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Tu', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('We', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Th', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Fr', [], [
        'context' => 'Abbreviated weekday',
      ]),
      t('Sa', [], [
        'context' => 'Abbreviated weekday',
      ]),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $weekdays : $weekdays;
  }

  /**
   * Constructs a translated array of 1-letter week day abbreviations.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of week day 1 letter abbreviations
   */
  public static function weekDaysAbbr1($required = FALSE) {
    $weekdays = [
      t('S', [], [
        'context' => 'Abbreviated 1 letter weekday Sunday',
      ]),
      t('M', [], [
        'context' => 'Abbreviated 1 letter weekday Monday',
      ]),
      t('T', [], [
        'context' => 'Abbreviated 1 letter weekday Tuesday',
      ]),
      t('W', [], [
        'context' => 'Abbreviated 1 letter weekday Wednesday',
      ]),
      t('T', [], [
        'context' => 'Abbreviated 1 letter weekday Thursday',
      ]),
      t('F', [], [
        'context' => 'Abbreviated 1 letter weekday Friday',
      ]),
      t('S', [], [
        'context' => 'Abbreviated 1 letter weekday Saturday',
      ]),
    ];
    $none = [
      '' => '',
    ];
    return !$required ? $none + $weekdays : $weekdays;
  }

  /**
   * Reorders weekdays to match the first day of the week.
   *
   * @param array $weekdays
   *   An array of weekdays.
   *
   * @return array
   *   An array of weekdays reordered to match the first day of the week. The
   *   keys will remain unchanged. For example, if the first day of the week is
   *   set to be Monday, the array keys will be [1, 2, 3, 4, 5, 6, 0].
   */
  public static function weekDaysOrdered($weekdays) {
    $first_day = \Drupal::config('system.date')
      ->get('first_day');
    if ($first_day > 0) {
      for ($i = 1; $i <= $first_day; $i++) {

        // Reset the array to the first element.
        reset($weekdays);

        // Retrieve the first week day value.
        $last = current($weekdays);

        // Store the corresponding key.
        $key = key($weekdays);

        // Remove this week day from the beginning of the array.
        unset($weekdays[$key]);

        // Add this week day to the end of the array.
        $weekdays[$key] = $last;
      }
    }
    return $weekdays;
  }

  /**
   * Constructs an array of years in a specified range.
   *
   * @param int $min
   *   (optional) The minimum year in the array. Defaults to zero.
   * @param int $max
   *   (optional) The maximum year in the array. Defaults to zero.
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of years in the selected range.
   */
  public static function years($min = 0, $max = 0, $required = FALSE) {

    // Ensure $min and $max are valid values.
    if (empty($min)) {
      $min = intval(date('Y', REQUEST_TIME) - 3);
    }
    if (empty($max)) {
      $max = intval(date('Y', REQUEST_TIME) + 3);
    }
    $none = [
      '' => '',
    ];
    $range = range($min, $max);
    $range = array_combine($range, $range);
    return !$required ? $none + $range : $range;
  }

  /**
   * Constructs an array of days in a month.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   * @param int $month
   *   (optional) The month in which to find the number of days. Defaults to
   *   NULL.
   * @param int $year
   *   (optional) The year in which to find the number of days. Defaults to
   *   NULL.
   *
   * @return array
   *   An array of days for the selected month.
   */
  public static function days($required = FALSE, $month = NULL, $year = NULL) {

    // If we have a month and year, find the right last day of the month.
    if (!empty($month) && !empty($year)) {
      $date = new DrupalDateTime($year . '-' . $month . '-01 00:00:00', 'UTC');
      $max = $date
        ->format('t');
    }

    // If there is no month and year given, default to 31.
    if (empty($max)) {
      $max = 31;
    }
    $none = [
      '' => '',
    ];
    $range = range(1, $max);
    $range = array_combine($range, $range);
    return !$required ? $none + $range : $range;
  }

  /**
   * Constructs an array of hours.
   *
   * @param string $format
   *   (optional) A date format string that indicates the format to use for the
   *   hours. Defaults to 'H'.
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of hours in the selected format.
   */
  public static function hours($format = 'H', $required = FALSE) {
    $hours = [];
    if ($format == 'h' || $format == 'g') {
      $min = 1;
      $max = 12;
    }
    else {
      $min = 0;
      $max = 23;
    }
    for ($i = $min; $i <= $max; $i++) {
      $formatted = $format == 'H' || $format == 'h' ? DrupalDateTime::datePad($i) : $i;
      $hours[$i] = $formatted;
    }
    $none = [
      '' => '',
    ];
    return !$required ? $none + $hours : $hours;
  }

  /**
   * Constructs an array of minutes.
   *
   * @param string $format
   *   (optional) A date format string that indicates the format to use for the
   *    minutes. Defaults to 'i'.
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   * @param int $increment
   *   An integer value to increment the values. Defaults to 1.
   *
   * @return array
   *   An array of minutes in the selected format.
   */
  public static function minutes($format = 'i', $required = FALSE, $increment = 1) {
    $minutes = [];

    // Ensure $increment has a value so we don't loop endlessly.
    if (empty($increment)) {
      $increment = 1;
    }
    for ($i = 0; $i < 60; $i += $increment) {
      $formatted = $format == 'i' ? DrupalDateTime::datePad($i) : $i;
      $minutes[$i] = $formatted;
    }
    $none = [
      '' => '',
    ];
    return !$required ? $none + $minutes : $minutes;
  }

  /**
   * Constructs an array of seconds.
   *
   * @param string $format
   *   (optional) A date format string that indicates the format to use for the
   *   seconds. Defaults to 's'.
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   * @param int $increment
   *   An integer value to increment the values. Defaults to 1.
   *
   * @return array
   *   An array of seconds in the selected format.
   */
  public static function seconds($format = 's', $required = FALSE, $increment = 1) {
    $seconds = [];

    // Ensure $increment has a value so we don't loop endlessly.
    if (empty($increment)) {
      $increment = 1;
    }
    for ($i = 0; $i < 60; $i += $increment) {
      $formatted = $format == 's' ? DrupalDateTime::datePad($i) : $i;
      $seconds[$i] = $formatted;
    }
    $none = [
      '' => '',
    ];
    return !$required ? $none + $seconds : $seconds;
  }

  /**
   * Constructs an array of AM and PM options.
   *
   * @param bool $required
   *   (optional) If FALSE, the returned array will include a blank value.
   *   Defaults to FALSE.
   *
   * @return array
   *   An array of AM and PM options.
   */
  public static function ampm($required = FALSE) {
    $none = [
      '' => '',
    ];
    $ampm = [
      'am' => t('am', [], [
        'context' => 'ampm',
      ]),
      'pm' => t('pm', [], [
        'context' => 'ampm',
      ]),
    ];
    return !$required ? $none + $ampm : $ampm;
  }

  /**
   * Identifies the number of days in a month for a date.
   *
   * @param mixed $date
   *   (optional) A DrupalDateTime object or a date string.
   *   Defaults to NULL, which means to use the current date.
   *
   * @return int
   *   The number of days in the month.
   */
  public static function daysInMonth($date = NULL) {
    if (!$date instanceof DrupalDateTime) {
      $date = new DrupalDateTime($date);
    }
    if (!$date
      ->hasErrors()) {
      return $date
        ->format('t');
    }
    return NULL;
  }

  /**
   * Identifies the number of days in a year for a date.
   *
   * @param mixed $date
   *   (optional) A DrupalDateTime object or a date string.
   *   Defaults to NULL, which means to use the current date.
   *
   * @return int
   *   The number of days in the year.
   */
  public static function daysInYear($date = NULL) {
    if (!$date instanceof DrupalDateTime) {
      $date = new DrupalDateTime($date);
    }
    if (!$date
      ->hasErrors()) {
      if ($date
        ->format('L')) {
        return 366;
      }
      else {
        return 365;
      }
    }
    return NULL;
  }

  /**
   * Returns day of week for a given date (0 = Sunday).
   *
   * @param mixed $date
   *   (optional) A DrupalDateTime object or a date string.
   *   Defaults to NULL, which means use the current date.
   *
   * @return int
   *   The number of the day in the week.
   */
  public static function dayOfWeek($date = NULL) {
    if (!$date instanceof DrupalDateTime) {
      $date = new DrupalDateTime($date);
    }
    if (!$date
      ->hasErrors()) {
      return $date
        ->format('w');
    }
    return NULL;
  }

  /**
   * Returns translated name of the day of week for a given date.
   *
   * @param mixed $date
   *   (optional) A DrupalDateTime object or a date string.
   *   Defaults to NULL, which means use the current date.
   * @param string $abbr
   *   (optional) Whether to return the abbreviated name for that day.
   *   Defaults to TRUE.
   *
   * @return string
   *   The name of the day in the week for that date.
   */
  public static function dayOfWeekName($date = NULL, $abbr = TRUE) {
    if (!$date instanceof DrupalDateTime) {
      $date = new DrupalDateTime($date);
    }
    $dow = self::dayOfWeek($date);
    $days = $abbr ? self::weekDaysAbbr() : self::weekDays();
    return $days[$dow];
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DateHelper::ampm	public static	function	Constructs an array of AM and PM options.
DateHelper::dayOfWeek	public static	function	Returns day of week for a given date (0 = Sunday).
DateHelper::dayOfWeekName	public static	function	Returns translated name of the day of week for a given date.
DateHelper::days	public static	function	Constructs an array of days in a month.
DateHelper::daysInMonth	public static	function	Identifies the number of days in a month for a date.
DateHelper::daysInYear	public static	function	Identifies the number of days in a year for a date.
DateHelper::hours	public static	function	Constructs an array of hours.
DateHelper::minutes	public static	function	Constructs an array of minutes.
DateHelper::monthNames	public static	function	Returns a translated array of month names.
DateHelper::monthNamesAbbr	public static	function	Constructs a translated array of month name abbreviations
DateHelper::monthNamesAbbrUntranslated	public static	function	Constructs an untranslated array of abbreviated month names.
DateHelper::monthNamesUntranslated	public static	function	Constructs an untranslated array of month names.
DateHelper::seconds	public static	function	Constructs an array of seconds.
DateHelper::weekDays	public static	function	Returns a translated array of week names.
DateHelper::weekDaysAbbr	public static	function	Constructs a translated array of week day abbreviations.
DateHelper::weekDaysAbbr1	public static	function	Constructs a translated array of 1-letter week day abbreviations.
DateHelper::weekDaysAbbr2	public static	function	Constructs a translated array of 2-letter week day abbreviations.
DateHelper::weekDaysOrdered	public static	function	Reorders weekdays to match the first day of the week.
DateHelper::weekDaysUntranslated	public static	function	Constructs an untranslated array of week days.
DateHelper::years	public static	function	Constructs an array of years in a specified range.