Negative DateInterval

Question

I want to create a DatePeriod object with a negative DateInterval.

This creates a DatePeriod with the year increasing from today to 2016.

$this->S         


        

Answer 1

I tried it myself and it isn't possible with DatePeriod alone, but I think that makes sense: It just reflects the periods, that usually doesn't have any specific order and therefore cannot get reordered (it can be treated as a set).

The only way to retrieve the dates and sort it in reversed order, as far as I can see, is something like this

$result = array();
forech ($dateperiod as $date) {
  array_push ($result, $data);
}

Update

$date = new DateTime('2016-06-06');
$i = new DateInterval('P1Y');
$now = new DateTime;
while ($date >= $now) {
  echo $date->format('c') . PHP_EOL;
  $date = $date->sub($i);
}