public function testCheckDate()
{
$this->assertTrue(jDateTime::checkDate(1391, 2, 30, true));
$this->assertFalse(jDateTime::checkDate(1395, 13, 10, true));
$this->assertFalse(jDateTime::checkDate(1395, 12, 31, true));
$this->assertFalse(jDateTime::checkDate(2015, 12, 31, true));
}