php-datetime

<?php
class DateTime extends \DateTime
{
    private static $DATE_NAMES = array('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday');
    private static $FORMATS = array('ymd' => 'Y-m-d', 'jenark' => 'm/d/y', 'mysql' => 'Y-m-d');
    private static $DEFAULT_FORMAT = 'ymd';

    public function __call($method, $args)
    {
        if (substr($method, 0, 2) === "is" && in_array(substr($method, 2), self::$DATE_NAMES))
        {
            if ($this->dayName() == substr($method, 2))
                return true;
            else
            return false;
        }
    }

    public function dayName()
    {
        return date('l', $this->getTimestamp());
    }

    public function format($format=null)
    {
        if (($f = self::getFormat($format)))
            return parent::format($f);
        elseif (!is_null($format))
            return parent::format($format);

        return parent::format(self::getDefaultFormat());
    }

    static public function getFormat($format=null)
    {
        if (!is_null($format) && array_key_exists($format, self::$FORMATS))
            return self::$FORMATS[$format];

        return null;
    }

    static public function getDefaultFormatName()
    {
        return self::$DEFAULT_FORMAT;
    }

    static public function getDefaultFormat()
    {
        return self::getFormat(self::getDefaultFormatName());
    }

    static public function setDefaultFormat($format)
    {
        self::$DEFAULT_FORMAT = $format;
    }

    static public function getLastMonday()
    {
        return new self('Last Monday');
    }

    public function __toString()
    {
        return $this->format();
    }

    static public function create($time = "now", DateTimeZone $timezone = NULL)
    {
        if ($timezone != NULL)
            return new self($time, $timezone);
        else
            return new self($time);
    }
}
?>