Days360.php

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<?php
 
namespace PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
 
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDateHelper;
 
class Days360
{
    public static function between($startDate = 0, $endDate = 0, $method = false)
    {
        try {
            $startDate = Helpers::getDateValue($startDate);
            $endDate = Helpers::getDateValue($endDate);
        } catch (Exception $e) {
            return $e->getMessage();
        }
 
        if (!is_bool($method)) {
            return Functions::VALUE();
        }
 
        // Execute function
        $PHPStartDateObject = SharedDateHelper::excelToDateTimeObject($startDate);
        $startDay = $PHPStartDateObject->format('j');
        $startMonth = $PHPStartDateObject->format('n');
        $startYear = $PHPStartDateObject->format('Y');
 
        $PHPEndDateObject = SharedDateHelper::excelToDateTimeObject($endDate);
        $endDay = $PHPEndDateObject->format('j');
        $endMonth = $PHPEndDateObject->format('n');
        $endYear = $PHPEndDateObject->format('Y');
 
        return self::dateDiff360((int) $startDay, (int) $startMonth, (int) $startYear, (int) $endDay, (int) $endMonth, (int) $endYear, !$method);
    }
 
    private static function dateDiff360(int $startDay, int $startMonth, int $startYear, int $endDay, int $endMonth, int $endYear, bool $methodUS): int
    {
        $startDay = self::getStartDay($startDay, $startMonth, $startYear, $methodUS);
        $endDay = self::getEndDay($endDay, $endMonth, $endYear, $startDay, $methodUS);
 
        return $endDay + $endMonth * 30 + $endYear * 360 - $startDay - $startMonth * 30 - $startYear * 360;
    }
 
    private static function getStartDay(int $startDay, int $startMonth, int $startYear, bool $methodUS): int
    {
        if ($startDay == 31) {
            --$startDay;
        } elseif ($methodUS && ($startMonth == 2 && ($startDay == 29 || ($startDay == 28 && !Helpers::isLeapYear($startYear))))) {
            $startDay = 30;
        }
 
        return $startDay;
    }
 
    private static function getEndDay(int $endDay, int &$endMonth, int &$endYear, int $startDay, bool $methodUS): int
    {
        if ($endDay == 31) {
            if ($methodUS && $startDay != 30) {
                $endDay = 1;
                if ($endMonth == 12) {
                    ++$endYear;
                    $endMonth = 1;
                } else {
                    ++$endMonth;
                }
            } else {
                $endDay = 30;
            }
        }
 
        return $endDay;
    }
}