Days.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;

use DateTimeInterface;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDateHelper;

class Days
{
    public static function between($endDate, $startDate)
    {
        try {
            $startDate = Helpers::getDateValue($startDate);
            $endDate = Helpers::getDateValue($endDate);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        // Execute function
        $PHPStartDateObject = SharedDateHelper::excelToDateTimeObject($startDate);
        $PHPEndDateObject = SharedDateHelper::excelToDateTimeObject($endDate);

        $days = Functions::VALUE();
        $diff = $PHPStartDateObject->diff($PHPEndDateObject);
        if ($diff !== false && !is_bool($diff->days)) {
            $days = $diff->days;
            if ($diff->invert) {
                $days = -$days;
            }
        }

        return $days;
    }
}