function testMultiplication()
{
$dur = new jDuration(array("year" => 1));
$dur->mult(10);
// Changed our mind, 10 years is better...
$dt = new jDateTime(2007, 1, 1, 23, 58, 3);
$dtExpected = new jDateTime(1997, 1, 1, 23, 58, 3);
$dt->sub($dur);
$this->assertEqual($dt, $dtExpected);
}
/**
* substract a <b>duration</b> to the date
* You can specify the duration in a jDuration object or give each value of
* the duration.
* @param jDuration/int $year the duration value or a year with 4 digits
* @param int $month month with 2 digits
* @param int $day day with 2 digits
* @param int $hour hour with 2 digits
* @param int $minute minute with 2 digits
* @param int $second second with 2 digits
*/
public function sub($year, $month = 0, $day = 0, $hour = 0, $minute = 0, $second = 0)
{
if ($year instanceof jDuration) {
$dt = $year;
} else {
$dt = new jDuration(array("year" => $year, "month" => $month, "day" => $day, "hour" => $hour, "minute" => $minute, "second" => $second));
}
$dt->mult(-1);
$this->add($dt);
}