Enviar formulario con fecha igual o inferior a la del servidor

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Hola

Prueba de esta manera

<?php require_once('Connections/basedatos.php'); ?>
<?php
$fecha_actual = strtotime(date("d-m-Y H:i:00",time()));
$fecha_limite = strtotime("11-5-2010 21:00:00");

if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
{
if (PHP_VERSION < 6) {
$theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
}

$theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

switch ($theType) {
case "text":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "long":
case "int":
$theValue = ($theValue != "") ? intval($theValue) : "NULL";
break;
case "double":
$theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
break;
case "date":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "defined":
$theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
break;
}
return $theValue;
}
}

$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
$editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "formulario1")) {

if($fecha_actual > $fecha_limite){
echo "Limite pasado";
} else {

$insertSQL = sprintf("INSERT INTO bdprueba (nombre, apellido1, apellido2) VALUES (%s, %s, %s)",
GetSQLValueString($_POST['nombre'], "text"),
GetSQLValueString($_POST['apellido1'], "text"),
GetSQLValueString($_POST['apellido2'], "text"));

mysql_select_db($database_basedatos, $basedatos);
$Result1 = mysql_query($insertSQL, $basedatos) or die(mysql_error());

$insertGoTo = "inicio.php";
if (isset($_SERVER['QUERY_STRING'])) {
$insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
$insertGoTo .= $_SERVER['QUERY_STRING'];
}
header(sprintf("Location: %s", $insertGoTo));
}
}
?>

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