PHP - Get working (business) seconds in given time range

README.md

Example of usage:

$workingHours = DateTimeHelper::getWorkingSeconds('2016-02-01 08:00:00', '2016-02-09 15:00:00', 10, 19, ['01.01', '02.01'], 'd.m') / (60 * 60);

DateTimeHelper.php

<?php

/**
 * @author DrDeath72 https://github.com/DrDeath72
 * @author arogachev <[email protected]>
 */
class DateTimeHelper
{
    /**
     * Get working (business) seconds in given time range
     * @param string $fromTime
     * @param string $toTime
     * @param integer $fromWorkingHour
     * @param integer $toWorkingHour
     * @param array $holidays
     * @param string $holidaysFormat
     * @return integer
     */
    public static function getWorkingSeconds($fromTime, $toTime, $fromWorkingHour, $toWorkingHour, $holidays, $holidaysFormat)
    {
        $startTimestamp = is_int($fromTime) ? $fromTime : strtotime($fromTime);
        $endTimestamp = is_int($toTime) ? $toTime : strtotime($toTime);
        $limitTimestamp = strtotime(date('Y-m-d 23:59:59', $endTimestamp));
        $workingSeconds = 0;
        $daySeconds = 60 * 60 * 24;

        for ($timestamp = $startTimestamp; $timestamp < $limitTimestamp; $timestamp += $daySeconds) {
            if (in_array(date($holidaysFormat, $timestamp), $holidays)) {
                continue;
            }

            $day = date('Y-m-d', $timestamp);
            $dayStartTimestamp = max(strtotime("$day $fromWorkingHour:00:00"), $startTimestamp);
            $dayEndTimestamp = min(strtotime("$day $toWorkingHour:00:00"), $endTimestamp);
            $workingSeconds += max(0, $dayEndTimestamp - $dayStartTimestamp);
        }

        return $workingSeconds;
    }
}