/**
  * @dataProvider data_plusDays
  */
 public function test_until_days(ZonedDateTime $base, $expected, ZonedDateTime $end)
 {
     if ($base->toLocalTime()->equals($end->toLocalTime()) == false) {
         return;
         // avoid DST gap input values
     }
     $this->assertEquals($base->until($end, CU::DAYS()), $expected);
 }