yii2-bootstrap/framework/validators/DateValidator.php

<?php
/**
 * DateValidator class file.
 *
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\validators;

/**
 * DateValidator verifies if the attribute represents a date, time or datetime.
 *
 * By setting the {@link format} property, one can specify what format the date value
 * must be in. If the given date value doesn't follow the format, the attribute is considered as invalid.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class DateValidator extends Validator
{
	/**
	 * @var mixed the format pattern that the date value should follow.
	 * This can be either a string or an array representing multiple formats.
	 * Defaults to 'MM/dd/yyyy'. Please see {@link CDateTimeParser} for details
	 * about how to specify a date format.
	 */
	public $format = 'MM/dd/yyyy';
	/**
	 * @var boolean whether the attribute value can be null or empty. Defaults to true,
	 * meaning that if the attribute is empty, it is considered valid.
	 */
	public $allowEmpty = true;
	/**
	 * @var string the name of the attribute to receive the parsing result.
	 * When this property is not null and the validation is successful, the named attribute will
	 * receive the parsing result.
	 */
	public $timestampAttribute;

	/**
	 * Validates the attribute of the object.
	 * If there is any error, the error message is added to the object.
	 * @param \yii\base\Model $object the object being validated
	 * @param string $attribute the attribute being validated
	 */
	public function validateAttribute($object, $attribute)
	{
		$value = $object->$attribute;
		if ($this->allowEmpty && $this->isEmpty($value)) {
			return;
		}

		$formats = is_string($this->format) ? array($this->format) : $this->format;
		$valid = false;
		foreach ($formats as $format) {
			$timestamp = CDateTimeParser::parse($value, $format, array('month' => 1, 'day' => 1, 'hour' => 0, 'minute' => 0, 'second' => 0));
			if ($timestamp !== false) {
				$valid = true;
				if ($this->timestampAttribute !== null) {
					$object-> {$this->timestampAttribute} = $timestamp;
				}
				break;
			}
		}

		if (!$valid) {
			$message = ($this->message !== null) ? $this->message : \Yii::t('yii', 'The format of {attribute} is invalid.');
			$this->addError($object, $attribute, $message);
		}
	}
}