Difference.php
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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
use DateInterval;
use DateTime;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDateHelper;
class Difference
{
/**
* DATEDIF.
*
* @param mixed $startDate Excel date serial value, PHP date/time stamp, PHP DateTime object
* or a standard date string
* @param mixed $endDate Excel date serial value, PHP date/time stamp, PHP DateTime object
* or a standard date string
* @param string $unit
*
* @return int|string Interval between the dates
*/
public static function interval($startDate, $endDate, $unit = 'D')
{
try {
$startDate = Helpers::getDateValue($startDate);
$endDate = Helpers::getDateValue($endDate);
$difference = self::initialDiff($startDate, $endDate);
$unit = strtoupper(Functions::flattenSingleValue($unit));
} catch (Exception $e) {
return $e->getMessage();
}
// Execute function
$PHPStartDateObject = SharedDateHelper::excelToDateTimeObject($startDate);
$startDays = (int) $PHPStartDateObject->format('j');
$startMonths = (int) $PHPStartDateObject->format('n');
$startYears = (int) $PHPStartDateObject->format('Y');
$PHPEndDateObject = SharedDateHelper::excelToDateTimeObject($endDate);
$endDays = (int) $PHPEndDateObject->format('j');
$endMonths = (int) $PHPEndDateObject->format('n');
$endYears = (int) $PHPEndDateObject->format('Y');
$PHPDiffDateObject = $PHPEndDateObject->diff($PHPStartDateObject);
$retVal = false;
$retVal = self::replaceRetValue($retVal, $unit, 'D') ?? self::datedifD($difference);
$retVal = self::replaceRetValue($retVal, $unit, 'M') ?? self::datedifM($PHPDiffDateObject);
$retVal = self::replaceRetValue($retVal, $unit, 'MD') ?? self::datedifMD($startDays, $endDays, $PHPEndDateObject, $PHPDiffDateObject);
$retVal = self::replaceRetValue($retVal, $unit, 'Y') ?? self::datedifY($PHPDiffDateObject);
$retVal = self::replaceRetValue($retVal, $unit, 'YD') ?? self::datedifYD($difference, $startYears, $endYears, $PHPStartDateObject, $PHPEndDateObject);
$retVal = self::replaceRetValue($retVal, $unit, 'YM') ?? self::datedifYM($PHPDiffDateObject);
return is_bool($retVal) ? Functions::VALUE() : $retVal;
}
private static function initialDiff(float $startDate, float $endDate): float
{
// Validate parameters
if ($startDate > $endDate) {
throw new Exception(Functions::NAN());
}
return $endDate - $startDate;
}
/**
* Decide whether it's time to set retVal.
*
* @param bool|int $retVal
*
* @return null|bool|int
*/
private static function replaceRetValue($retVal, string $unit, string $compare)
{
if ($retVal !== false || $unit !== $compare) {
return $retVal;
}
return null;
}
private static function datedifD(float $difference): int
{
return (int) $difference;
}
private static function datedifM(DateInterval $PHPDiffDateObject): int
{
return 12 * (int) $PHPDiffDateObject->format('%y') + (int) $PHPDiffDateObject->format('%m');
}
private static function datedifMD(int $startDays, int $endDays, DateTime $PHPEndDateObject, DateInterval $PHPDiffDateObject): int
{
if ($endDays < $startDays) {
$retVal = $endDays;
$PHPEndDateObject->modify('-' . $endDays . ' days');
$adjustDays = (int) $PHPEndDateObject->format('j');
$retVal += ($adjustDays - $startDays);
} else {
$retVal = (int) $PHPDiffDateObject->format('%d');
}
return $retVal;
}
private static function datedifY(DateInterval $PHPDiffDateObject): int
{
return (int) $PHPDiffDateObject->format('%y');
}
private static function datedifYD(float $difference, int $startYears, int $endYears, DateTime $PHPStartDateObject, DateTime $PHPEndDateObject): int
{
$retVal = (int) $difference;
if ($endYears > $startYears) {
$isLeapStartYear = $PHPStartDateObject->format('L');
$wasLeapEndYear = $PHPEndDateObject->format('L');
// Adjust end year to be as close as possible as start year
while ($PHPEndDateObject >= $PHPStartDateObject) {
$PHPEndDateObject->modify('-1 year');
$endYears = $PHPEndDateObject->format('Y');
}
$PHPEndDateObject->modify('+1 year');
// Get the result
$retVal = $PHPEndDateObject->diff($PHPStartDateObject)->days;
// Adjust for leap years cases
$isLeapEndYear = $PHPEndDateObject->format('L');
$limit = new DateTime($PHPEndDateObject->format('Y-02-29'));
if (!$isLeapStartYear && !$wasLeapEndYear && $isLeapEndYear && $PHPEndDateObject >= $limit) {
--$retVal;
}
}
return (int) $retVal;
}
private static function datedifYM(DateInterval $PHPDiffDateObject): int
{
return (int) $PHPDiffDateObject->format('%m');
}
}