public function testConvDate()
{
$this->assertNull(Html::convDate(null));
$this->assertNull(Html::convDate('NULL'));
$mydate = date('Y-m-d H:i:s');
$expected = date('Y-m-d');
unset($_SESSION['glpidate_format']);
$this->assertEquals($expected, Html::convDate($mydate));
$_SESSION['glpidate_format'] = 0;
$this->assertEquals($expected, Html::convDate($mydate));
$this->assertEquals($expected, Html::convDate(date('Y-m-d')));
$expected = date('d-m-Y');
$this->assertEquals($expected, Html::convDate($mydate, 1));
$expected = date('m-d-Y');
$this->assertEquals($expected, Html::convDate($mydate, 2));
}