/** * @ŧest */ public function testSubMonth() { $date = new HammerTime('2014-05-31 12:00:00'); $date->subMonths(1); $this->assertEquals(new HammerTime('2014-04-30 12:00:00'), $date); $date = new HammerTime('2014-05-31 12:00:00'); $date->subMonths(2); $this->assertEquals(new HammerTime('2014-03-31 12:00:00'), $date); }