durationmanager.php

См. документацию.

<?php
 
namespace Bitrix\Calendar\Core\Managers\Duration;
 
use Bitrix\Calendar\Core\Base\Date;
 
class DurationManager
{
    private const MINUTE_LENGTH = 60;
    private const HOUR_LENGTH = 60 * self::MINUTE_LENGTH;
    private const DAY_LENGTH = 24 * self::HOUR_LENGTH;
 
    private Date $start;
    private Date $end;
 
    public function __construct(Date $start, Date $end)
    {
        $this->start = $start;
        $this->end = $end;
    }

    public function getFormattedDuration(): string
    {
        $duration = $this->getDuration();
        if (!$this->isPositiveDuration())
        {
            $result = FormatDate('idiff', time(), time());
        }
 
        if (empty($result))
        {
            $result = '';
            if ($duration >= self::DAY_LENGTH)
            {
                $result .= FormatDate('ddiff', time(), $duration + time()) . " ";
            }
            $duration = $duration % self::DAY_LENGTH;
            if ($duration >= self::HOUR_LENGTH)
            {
                $result .= FormatDate('Hdiff', time(), $duration + time()) . " ";
            }
            $duration = $duration % self::HOUR_LENGTH;
            if ($duration >= self::MINUTE_LENGTH)
            {
                $result .= FormatDate('idiff', time(), $duration + time());
            }
        }
 
        return trim($result);
    }

    public function isPositiveDuration(): bool
    {
        return $this->getDuration() >= self::MINUTE_LENGTH;
    }

    public function getDuration(): int
    {
        return $this->calculateDuration($this->start->getTimestamp(), $this->end->getTimestamp());
    }

    private function calculateDuration(int $start, int $end): int
    {
        return $end - $start;
    }

    public function areDurationsEqual(Date $start, Date $end): bool
    {
        return $this->getDuration() === $this->calculateDuration($start->getTimestamp(), $end->getTimestamp());
    }
}