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$timestamp=time();

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$datum=date("d.m.Y",$timestamp); ### Format: DD.MM.JJJJJ
$uhrzeit=date("H:i:s",$timestamp); ### Format: HH:MM:SS

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$timestamp2=mktime(intval($stunden),
intval($minuten),
intval($sekunden),
intval($monat),
intval($tag),
intval($jahr));

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if (time()>$timestamp) $vergangenheit=true;
else $zukunft=true;

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// Übernahme des Formulars in die Datenbank
$sql="INSERT INTO $tabellenname (date, time_start, time_end, channel, title, text, langtext, picture, gay, lesbian, travestie, hiv, tipp) values ('$date', '$time_start', '$time_end', '$channel', '$title', '$text', '$langtext', '$picture', '$gay', '$lesbian', '$travestie', '$hiv', '$tipp')";

// Erstellen der Variable $date ($time_start und $time_end funktionieren analog)
..

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$sql = mysql_query ("SELECT ID,name,DATE_FORMAT(offer_end,'%d.%m.%Y'),DATE_FORMAT(res_begin,'%d.%m.%Y'),DATE_FORMAT(res_end,'%d.%m.%Y'),price,price_offer,member_max,member_act,description,organizer,insurance,archived FROM tour_reise WHERE ID=$ID");

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 SET dein_datum='".$datum_str."' WHERE ";
mysql_qu.....
?>

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 SET dein_datum='".$dein_format."' WHERE ";
mysql_qu.....
?>