Confronto date in php

[theboss280489]

Niente ora non mi esporta niente. Posto il codice completo:

<?php
$start = $_POST['data1'];
$end = $_POST['data2'];
$obj=new sast1com();
$obj->connessione();
$dati=mysql_query("select * from turni where eliminata = 0 AND data BETWEEN $start and $end ORDER BY data DESC");

Ho provato anche con:

<?php
$start = $_POST['data1'];
$end = $_POST['data2'];
$obj=new sast1com();
$obj->connessione();
$dati=mysql_query("select * from turni where eliminata = 0 && data BETWEEN $start and $end ORDER BY data DESC");

Niente