public function testHowToKnowIfDateIsDuringWeekendOrWeekday() { $tuesday = new Date(2013, 1, 1); $saturday = $tuesday->plus(new Duration(4, TimeUnit::day())); $this->assertFalse($tuesday->isWeekEndDay()); $this->assertTrue($tuesday->isWeekDay()); $this->assertTrue($saturday->isWeekEndDay()); $this->assertFalse($saturday->isWeekDay()); }