public function FixedReferenceDateInterval::calculateStart in Recurring Time Period 8

Calculates the end of the previous period.

Parameters

\DateTimeImmutable $date: The date and time to begin the period from.

Return value

\DateTimeImmutable|int The expiry date and time, or RecurringPeriodInterface::UNLIMITED.

Overrides RecurringPeriodBase::calculateStart

File

src/Plugin/RecurringPeriod/FixedReferenceDateInterval.php, line 88

Class

FixedReferenceDateInterval

Provides a fixed date period.

Namespace

Drupal\recurring_period\Plugin\RecurringPeriod

Code

public function calculateStart(\DateTimeImmutable $date) {
  $config = $this
    ->getConfiguration();
  $interval = $this
    ->getDateInterval();
  $reference_date = new \DateTimeImmutable($config['reference_date'], $date
    ->getTimezone());
  $start_date = $reference_date;
  $is_reference_date_in_future = $start_date
    ->diff($date)->invert;
  if ($is_reference_date_in_future) {

    // The reference date is in the future, so rewind it until it precedes
    // the start date.
    while ($start_date
      ->diff($date)->invert == TRUE) {
      $start_date = $start_date
        ->sub($interval);
    }
  }
  else {

    // The reference date is in the past, so fast forward it until the next
    // increment beyond the start date, then subtract one interval.
    while ($start_date
      ->diff($date)->invert == FALSE) {
      $start_date = $start_date
        ->add($interval);
    }
    $start_date = $start_date
      ->sub($interval);
  }
  return $start_date;
}