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Differences Between: [Versions 402 and 403]

   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  namespace OpenSpout\Writer\XLSX\Helper;
   6  
   7  use DateTimeInterface;
   8  
   9  /**
  10   * @internal
  11   */
  12  final class DateHelper
  13  {
  14      /**
  15       * @see https://github.com/PHPOffice/PhpSpreadsheet/blob/1.22.0/src/PhpSpreadsheet/Shared/Date.php#L296
  16       */
  17      public static function toExcel(DateTimeInterface $dateTime): float
  18      {
  19          $year = (int) $dateTime->format('Y');
  20          $month = (int) $dateTime->format('m');
  21          $day = (int) $dateTime->format('d');
  22          $hours = (int) $dateTime->format('H');
  23          $minutes = (int) $dateTime->format('i');
  24          $seconds = (int) $dateTime->format('s');
  25          // Fudge factor for the erroneous fact that the year 1900 is treated as a Leap Year in MS Excel
  26          // This affects every date following 28th February 1900
  27          $excel1900isLeapYear = 1;
  28          if ((1900 === $year) && ($month <= 2)) {
  29              $excel1900isLeapYear = 0;
  30          }
  31          $myexcelBaseDate = 2415020;
  32  
  33          //    Julian base date Adjustment
  34          if ($month > 2) {
  35              $month -= 3;
  36          } else {
  37              $month += 9;
  38              --$year;
  39          }
  40  
  41          //    Calculate the Julian Date, then subtract the Excel base date (JD 2415020 = 31-Dec-1899 Giving Excel Date of 0)
  42          $century = (int) substr((string) $year, 0, 2);
  43          $decade = (int) substr((string) $year, 2, 2);
  44          $excelDate =
  45              floor((146097 * $century) / 4)
  46              + floor((1461 * $decade) / 4)
  47              + floor((153 * $month + 2) / 5)
  48              + $day
  49              + 1721119
  50              - $myexcelBaseDate
  51              + $excel1900isLeapYear;
  52  
  53          $excelTime = (($hours * 3600) + ($minutes * 60) + $seconds) / 86400;
  54  
  55          return $excelDate + $excelTime;
  56      }
  57  }