vendor/illuminate/support/InteractsWithTime.php

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<?php

namespace Illuminate\Support;

use DateInterval;
use DateTimeInterface;

trait InteractsWithTime
{
    /**
     * Get the number of seconds until the given DateTime.
     *
     * @param  \DateTimeInterface|\DateInterval|int  $delay
     * @return int
     */
    protected function secondsUntil($delay)
    {
        $delay = $this->parseDateInterval($delay);

        return $delay instanceof DateTimeInterface
                            ? max(0, $delay->getTimestamp() - $this->currentTime())
                            : (int) $delay;
    }

    /**
     * Get the "available at" UNIX timestamp.
     *
     * @param  \DateTimeInterface|\DateInterval|int  $delay
     * @return int
     */
    protected function availableAt($delay = 0)
    {
        $delay = $this->parseDateInterval($delay);

        return $delay instanceof DateTimeInterface
                            ? $delay->getTimestamp()
                            : Carbon::now()->addRealSeconds($delay)->getTimestamp();
    }

    /**
     * If the given value is an interval, convert it to a DateTime instance.
     *
     * @param  \DateTimeInterface|\DateInterval|int  $delay
     * @return \DateTimeInterface|int
     */
    protected function parseDateInterval($delay)
    {
        if ($delay instanceof DateInterval) {
            $delay = Carbon::now()->add($delay);
        }

        return $delay;
    }

    /**
     * Get the current system time as a UNIX timestamp.
     *
     * @return int
     */
    protected function currentTime()