Format mySql timestamp/date field values into many different variations

niceDate.php

<?php
/**
 * Convert a mySql timestamp / date value to a nice looking date
 *
 * @param string $date - mySql Database timestamp / date field value
 * @param num/bol $layout - Date Layout values 1 to 7 for different styles:
 *                          [1] eg. 01.Jan.1970, 00:10:01 
 *                          [2] eg. 01.01.1970 
 *                          [3] eg. 00:10 
 *                          [4] eg. 01 January 1970 
 *                          [5] eg. Thursday, 01. Jan. 1970 
 *                          [6] eg. January 1970 
 *                          [7] ISO-8601 week number eg. 01-1970
 *                          [default] eg. 01.Jan.1970, 00:10     
 * @param string $local - set localization; default is german
 * @return string
 */
public function niceDate($date, $layout = false, $local = 'de_DE') {

    if ($date == '0000-00-00 00:00:00') {

        return;

    }

    setlocale(LC_ALL, $local);

    $unixTimestamp = strtotime($date);

    if ($unixTimestamp <= '-1') {

        $unixTimestamp = strtotime(
                        sprintf(
                            '%02s-%02s-%02s %02s:%02s:%02s',
                            substr($date, 0, 4),
                            substr($date, 4, 2),
                            substr($date, 6, 2),
                            substr($date, 8, 2),
                            substr($date, 10 ,2),
                            substr($date, 12 ,2)
                        )
                    );

    }

    switch ($layout) {

        // eg. 01.Jan.1970, 00:10:01
        case $layout == 1:
            return strftime('%d.%b.%Y, %H:%M:%S', $unixTimestamp);

        // eg. 01.01.1970
        case $layout == 2:
            return strftime('%d.%m.%Y', $unixTimestamp);

        // eg. 00:10
        case $layout == 3:
            return strftime('%H:%M', $unixTimestamp);

        // eg. 01 January 1970
        case $layout == 4:
            return strftime('%d %B %Y', $unixTimestamp);

        // eg. Thursday, 01. Jan. 1970
        case $layout == 5:
            return strftime('%A, %d. %b %Y', $unixTimestamp);

        // eg. January 1970
        case $layout == 6:
            return strftime('%B %Y', $unixTimestamp);

        // ISO-8601 week number eg. 01-1970
        case $layout == 7:
            return strftime('%V-%Y', $unixTimestamp);

        // eg. 01.Jan.1970, 00:10
        default:
            return strftime('%d.%b.%Y, %H:%M', $unixTimestamp);

    }

}