class.dateTimeConverter.php

class dateTimeConverter
{
	public static function getGermanDay( $timestamp, $long = TRUE )
	{
		if( $long )
			$days = array( "Sonntag", "Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag" );
		else
			$days = array( "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa" );
 
		$day = date( "w", $timestamp );
		return $days[$day];
	}
 
	public static function getGermanMonth( $timestamp, $maxLetters = 9 )
	{
		$monthInt = date( "n", $timestamp );
 
		if( $maxLetters == 3 )
		{
			$months = array( "Jan", "Feb", "Mrz", "Apr", "Mai", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dez" );
			return $months[$monthInt-1];
		}
 
		elseif( $maxLetters == 4 )
		{
			$months = array( "Jan.", "Feb.", "März", "Apr.", "Mai", "Juni", "Juli", "Aug.", "Sept.", "Okt.", "Nov.", "Dez." );
			return $months[$monthInt-1];
		}
		else
		{
			$months = array( "Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember" );		
			return substr( $months[$monthInt-1], 0, $maxLetters );
		}
	}
 
	public static function getGermanDate( $timestamp )
	{
		$weekday = dateTimeConverter::getGermanDay( $timestamp );
		$day = date( "d", $timestamp );
		$month = dateTimeConverter::getGermanMonth( $timestamp );
		$year = date( "Y", $timestamp );
		return $weekday . ", " . $day . " " . $month . " " . $year;
	}
 
	public static function convertDateFromDB( $date ) // date from database to german
	{
		$jahr	= substr( $date, 0, 4 );
		$mon  	= substr( $date, 5, 2 );
		$tag  	= substr( $date, 8, 2 );
		return $tag . "." . $mon . "." .$jahr;
	}
 
	public static function convertDateForDB( $date, $delimiter ="." ) // date for database (from d.m.Y to Y-m-d)
	{
		if( empty( $delimiter ) )
			return false;
                else {
 
                        $dateArray = explode( $delimiter, $date );
 
                        if( count( $dateArray ) == 3 ) // day, month and year
                                return $dateArray[2] . "-" . $dateArray[1] . "-" . $dateArray[0];
		        else
		        	return false;
		}
	}
 
	public static function createUnixTimestamp( $date, $hour = 0, $minute = 0 ) // timestamp from database
	{
		$year 	= substr( $date, 0, 4 );
		$month	= substr( $date, 5, 2 );
		$day	= substr( $date, 8, 2 );
		return mktime( $hour, $minute, 0, $month, $day, $year );
	}
 
	function getOnlyTimeFromDB( $db_timestamp ) // deutsche Uhrzeit aus Datenbank-Eintrag extrahieren
	{
		return substr( $db_timestamp, 10 );
	}
}

$timestamp = 188554980;
echo "<p>Tag lang: " . dateTimeConverter::getGermanDay( $timestamp ) . "</p>";
echo "<p>Tag kurz: " . dateTimeConverter::getGermanDay( $timestamp, false ) . "</p>";
echo "<p>Monat: " . dateTimeConverter::getGermanMonth( $timestamp, 4 ) . "</p>";
echo "<p>" . dateTimeConverter::getGermanDate( $timestamp ) . "</p>";