DateTimeItemInterface.php

<?php

namespace Drupal\datetime\Plugin\Field\FieldType;


/**
 * Interface definition for Datetime items.
 */
interface DateTimeItemInterface {
    
    /**
     * Defines the timezone that dates should be stored in.
     */
    const STORAGE_TIMEZONE = 'UTC';
    
    /**
     * Defines the format that date and time should be stored in.
     */
    const DATETIME_STORAGE_FORMAT = 'Y-m-d\\TH:i:s';
    
    /**
     * Defines the format that dates should be stored in.
     */
    const DATE_STORAGE_FORMAT = 'Y-m-d';

}