Schedule/Timestamp/Processor.php
public function process(ScheduleInterface $schedule, \DateTime $currentDateTime = null)
    {
        $now = ($currentDateTime == null) ? new \DateTime() : $currentDateTime;

        if($schedule->getScheduledAt() !== null)
        {
            return false;
        }

        if($schedule->getExpression() < $now->getTimestamp())
        {
            return true;
        }

        return false;
    }
public function process(ScheduleInterface $schedule, \DateTime $currentDateTime = null)
    {
        $now = ($currentDateTime == null) ? new \DateTime() : $currentDateTime;

        if($schedule->getScheduledAt() !== null)
        {
            return false;
        }

        if($schedule->getExpression() < $now->getTimestamp())
        {
            return true;
        }

        return false;
    }
{@inheritDoc}