public function testConvDateTime()
{
$this->assertNull(Html::convDateTime(null));
$this->assertNull(Html::convDateTime('NULL'));
$mydate = date('Y-m-d H:i:s');
$expected = date('Y-m-d H:i');
$this->assertEquals($expected, Html::convDateTime($mydate));
$expected = date('d-m-Y H:i');
$this->assertEquals($expected, Html::convDateTime($mydate, 1));
$expected = date('m-d-Y H:i');
$this->assertEquals($expected, Html::convDateTime($mydate, 2));
}