<?php

namespace PhpOffice\PhpSpreadsheet\Shared;


> use DateTime;


use DateTimeInterface;
use DateTimeZone;

< use PhpOffice\PhpSpreadsheet\Calculation\DateTime;



> use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;


use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Cell\Cell;

> use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;


use PhpOffice\PhpSpreadsheet\Style\NumberFormat;

class Date
{
    /** constants */
    const CALENDAR_WINDOWS_1900 = 1900; //    Base date of 1st Jan 1900 = 1.0
    const CALENDAR_MAC_1904 = 1904; //    Base date of 2nd Jan 1904 = 1.0

    /**
     * Names of the months of the year, indexed by shortname
     * Planned usage for locale settings.
     *
     * @var string[]
     */
    public static $monthNames = [
        'Jan' => 'January',
        'Feb' => 'February',
        'Mar' => 'March',
        'Apr' => 'April',
        'May' => 'May',
        'Jun' => 'June',
        'Jul' => 'July',
        'Aug' => 'August',
        'Sep' => 'September',
        'Oct' => 'October',
        'Nov' => 'November',
        'Dec' => 'December',
    ];

    /**
     * @var string[]
     */
    public static $numberSuffixes = [
        'st',
        'nd',
        'rd',
        'th',
    ];

    /**
     * Base calendar year to use for calculations
     * Value is either CALENDAR_WINDOWS_1900 (1900) or CALENDAR_MAC_1904 (1904).
     *
     * @var int
     */
    protected static $excelCalendar = self::CALENDAR_WINDOWS_1900;

    /**
     * Default timezone to use for DateTime objects.
     *

<      * @var null|\DateTimeZone



>      * @var null|DateTimeZone


     */
    protected static $defaultTimeZone;

    /**
     * Set the Excel calendar (Windows 1900 or Mac 1904).
     *

<      * @param int $baseDate Excel base date (1900 or 1904)



>      * @param int $baseYear Excel base date (1900 or 1904)


     *
     * @return bool Success or failure
     */

<     public static function setExcelCalendar($baseDate)



>     public static function setExcelCalendar($baseYear)


    {

<         if (($baseDate == self::CALENDAR_WINDOWS_1900) ||
<             ($baseDate == self::CALENDAR_MAC_1904)) {
<             self::$excelCalendar = $baseDate;



>         if (
>             ($baseYear == self::CALENDAR_WINDOWS_1900) ||
>             ($baseYear == self::CALENDAR_MAC_1904)
>         ) {
>             self::$excelCalendar = $baseYear;



            return true;
        }

        return false;
    }

    /**
     * Return the Excel calendar (Windows 1900 or Mac 1904).
     *
     * @return int Excel base date (1900 or 1904)
     */
    public static function getExcelCalendar()
    {
        return self::$excelCalendar;
    }

    /**
     * Set the Default timezone to use for dates.
     *

<      * @param DateTimeZone|string $timeZone The timezone to set for all Excel datetimestamp to PHP DateTime Object conversions



>      * @param null|DateTimeZone|string $timeZone The timezone to set for all Excel datetimestamp to PHP DateTime Object conversions


     *

<      * @throws \Exception
<      *
<      * @return bool Success or failure


     * @return bool Success or failure
     */
    public static function setDefaultTimezone($timeZone)
    {

<         if ($timeZone = self::validateTimeZone($timeZone)) {



>         try {
>             $timeZone = self::validateTimeZone($timeZone);


            self::$defaultTimeZone = $timeZone;

>             $retval = true;

>         } catch (PhpSpreadsheetException $e) {
            return true;
>             $retval = false;
        }
>         }



<             return true;



>         return $retval;



<         return false;



>     /**
>      * Return the Default timezone, or UTC if default not set.
>      */
>     public static function getDefaultTimezone(): DateTimeZone
>     {
>         return self::$defaultTimeZone ?? new DateTimeZone('UTC');


    }

    /**

<      * Return the Default timezone being used for dates.
<      *
<      * @return DateTimeZone The timezone being used as default for Excel timestamp to PHP DateTime object



>      * Return the Default timezone, or local timezone if default is not set.


     */

<     public static function getDefaultTimezone()



>     public static function getDefaultOrLocalTimezone(): DateTimeZone


    {

<         if (self::$defaultTimeZone === null) {
<             self::$defaultTimeZone = new DateTimeZone('UTC');



>         return self::$defaultTimeZone ?? new DateTimeZone(date_default_timezone_get());


        }


>     /**
        return self::$defaultTimeZone;
>      * Return the Default timezone even if null.
    }
>      */

>     public static function getDefaultTimezoneOrNull(): ?DateTimeZone
    /**
>     {


     * Validate a timezone.
     *

<      * @param DateTimeZone|string $timeZone The timezone to validate, either as a timezone string or object



>      * @param null|DateTimeZone|string $timeZone The timezone to validate, either as a timezone string or object


     *

<      * @throws \Exception
<      *
<      * @return DateTimeZone The timezone as a timezone object
<      * @return DateTimeZone The timezone as a timezone object



>      * @return ?DateTimeZone The timezone as a timezone object


     */

<     protected static function validateTimeZone($timeZone)



>     private static function validateTimeZone($timeZone)


    {

<         if (is_object($timeZone) && $timeZone instanceof DateTimeZone) {



>         if ($timeZone instanceof DateTimeZone || $timeZone === null) {


            return $timeZone;

<         } elseif (is_string($timeZone)) {



>         }
>         if (in_array($timeZone, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC))) {


            return new DateTimeZone($timeZone);
        }


<         throw new \Exception('Invalid timezone');



>         throw new PhpSpreadsheetException('Invalid timezone');


    }

    /**
     * Convert a MS serialized datetime value from Excel to a PHP Date/Time object.
     *
     * @param float|int $excelTimestamp MS Excel serialized date/time value
     * @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,
     *                                                                        if you don't want to treat it as a UTC value

<      *                                                                    Use the default (UST) unless you absolutely need a conversion
<      *
<      * @throws \Exception



>      *                                                                    Use the default (UTC) unless you absolutely need a conversion


     *

<      * @return \DateTime PHP date/time object



>      * @return DateTime PHP date/time object


     */
    public static function excelToDateTimeObject($excelTimestamp, $timeZone = null)
    {
        $timeZone = ($timeZone === null) ? self::getDefaultTimezone() : self::validateTimeZone($timeZone);
        if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_EXCEL) {

<             if ($excelTimestamp < 1.0) {



>             if ($excelTimestamp < 1 && self::$excelCalendar === self::CALENDAR_WINDOWS_1900) {


                // Unix timestamp base date

<                 $baseDate = new \DateTime('1970-01-01', $timeZone);



>                 $baseDate = new DateTime('1970-01-01', $timeZone);


            } else {
                // MS Excel calendar base dates
                if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {
                    // Allow adjustment for 1900 Leap Year in MS Excel

<                     $baseDate = ($excelTimestamp < 60) ? new \DateTime('1899-12-31', $timeZone) : new \DateTime('1899-12-30', $timeZone);



>                     $baseDate = ($excelTimestamp < 60) ? new DateTime('1899-12-31', $timeZone) : new DateTime('1899-12-30', $timeZone);


                } else {

<                     $baseDate = new \DateTime('1904-01-01', $timeZone);



>                     $baseDate = new DateTime('1904-01-01', $timeZone);


                }
            }
        } else {

<             $baseDate = new \DateTime('1899-12-30', $timeZone);



>             $baseDate = new DateTime('1899-12-30', $timeZone);


        }

        $days = floor($excelTimestamp);
        $partDay = $excelTimestamp - $days;
        $hours = floor($partDay * 24);
        $partDay = $partDay * 24 - $hours;
        $minutes = floor($partDay * 60);
        $partDay = $partDay * 60 - $minutes;
        $seconds = round($partDay * 60);

        if ($days >= 0) {
            $days = '+' . $days;
        }
        $interval = $days . ' days';

        return $baseDate->modify($interval)
            ->setTime((int) $hours, (int) $minutes, (int) $seconds);
    }

    /**
     * Convert a MS serialized datetime value from Excel to a unix timestamp.

>      * The use of Unix timestamps, and therefore this function, is discouraged.
     *
>      * They are not Y2038-safe on a 32-bit system, and have no timezone info.


     * @param float|int $excelTimestamp MS Excel serialized date/time value
     * @param null|DateTimeZone|string $timeZone The timezone to assume for the Excel timestamp,
     *                                                                        if you don't want to treat it as a UTC value

<      *                                                                    Use the default (UST) unless you absolutely need a conversion
<      *
<      * @throws \Exception



>      *                                                                    Use the default (UTC) unless you absolutely need a conversion


     *
     * @return int Unix timetamp for this date/time
     */
    public static function excelToTimestamp($excelTimestamp, $timeZone = null)
    {
        return (int) self::excelToDateTimeObject($excelTimestamp, $timeZone)
            ->format('U');
    }

    /**
     * Convert a date from PHP to an MS Excel serialized date/time value.
     *

<      * @param mixed $dateValue Unix Timestamp or PHP DateTime object or a string



>      * @param mixed $dateValue PHP DateTime object or a string - Unix timestamp is also permitted, but discouraged;
>      *    not Y2038-safe on a 32-bit system, and no timezone info


     *
     * @return bool|float Excel date/time value
     *                                  or boolean FALSE on failure
     */
    public static function PHPToExcel($dateValue)
    {
        if ((is_object($dateValue)) && ($dateValue instanceof DateTimeInterface)) {
            return self::dateTimeToExcel($dateValue);
        } elseif (is_numeric($dateValue)) {
            return self::timestampToExcel($dateValue);
        } elseif (is_string($dateValue)) {
            return self::stringToExcel($dateValue);
        }

        return false;
    }

    /**
     * Convert a PHP DateTime object to an MS Excel serialized date/time value.
     *
     * @param DateTimeInterface $dateValue PHP DateTime object
     *
     * @return float MS Excel serialized date/time value
     */
    public static function dateTimeToExcel(DateTimeInterface $dateValue)
    {
        return self::formattedPHPToExcel(
            (int) $dateValue->format('Y'),
            (int) $dateValue->format('m'),
            (int) $dateValue->format('d'),
            (int) $dateValue->format('H'),
            (int) $dateValue->format('i'),
            (int) $dateValue->format('s')
        );
    }

    /**
     * Convert a Unix timestamp to an MS Excel serialized date/time value.

>      * The use of Unix timestamps, and therefore this function, is discouraged.
     *
>      * They are not Y2038-safe on a 32-bit system, and have no timezone info.



<      * @param int $dateValue Unix Timestamp



>      * @param int $unixTimestamp Unix Timestamp


     *

<      * @return float MS Excel serialized date/time value



>      * @return false|float MS Excel serialized date/time value


     */

<     public static function timestampToExcel($dateValue)



>     public static function timestampToExcel($unixTimestamp)


    {

<         if (!is_numeric($dateValue)) {



>         if (!is_numeric($unixTimestamp)) {


            return false;
        }


<         return self::dateTimeToExcel(new \DateTime('@' . $dateValue));



>         return self::dateTimeToExcel(new DateTime('@' . $unixTimestamp));


    }

    /**
     * formattedPHPToExcel.
     *
     * @param int $year
     * @param int $month
     * @param int $day
     * @param int $hours
     * @param int $minutes
     * @param int $seconds
     *
     * @return float Excel date/time value
     */
    public static function formattedPHPToExcel($year, $month, $day, $hours = 0, $minutes = 0, $seconds = 0)
    {
        if (self::$excelCalendar == self::CALENDAR_WINDOWS_1900) {
            //
            //    Fudge factor for the erroneous fact that the year 1900 is treated as a Leap Year in MS Excel
            //    This affects every date following 28th February 1900
            //
            $excel1900isLeapYear = true;
            if (($year == 1900) && ($month <= 2)) {
                $excel1900isLeapYear = false;
            }
            $myexcelBaseDate = 2415020;
        } else {
            $myexcelBaseDate = 2416481;
            $excel1900isLeapYear = false;
        }

        //    Julian base date Adjustment
        if ($month > 2) {
            $month -= 3;
        } else {
            $month += 9;
            --$year;
        }

        //    Calculate the Julian Date, then subtract the Excel base date (JD 2415020 = 31-Dec-1899 Giving Excel Date of 0)

<         $century = substr($year, 0, 2);
<         $decade = substr($year, 2, 2);



>         $century = (int) substr($year, 0, 2);
>         $decade = (int) substr($year, 2, 2);


        $excelDate = floor((146097 * $century) / 4) + floor((1461 * $decade) / 4) + floor((153 * $month + 2) / 5) + $day + 1721119 - $myexcelBaseDate + $excel1900isLeapYear;

        $excelTime = (($hours * 3600) + ($minutes * 60) + $seconds) / 86400;

        return (float) $excelDate + $excelTime;
    }

    /**
     * Is a given cell a date/time?
     *

<      * @param Cell $pCell
<      *


     * @return bool
     */

<     public static function isDateTime(Cell $pCell)



>     public static function isDateTime(Cell $cell)


    {

<         return is_numeric($pCell->getValue()) &&



>         return is_numeric($cell->getCalculatedValue()) &&


            self::isDateTimeFormat(

<                 $pCell->getWorksheet()->getStyle(
<                     $pCell->getCoordinate()



>                 $cell->getWorksheet()->getStyle(
>                     $cell->getCoordinate()


                )->getNumberFormat()
            );
    }

    /**
     * Is a given number format a date/time?
     *

<      * @param NumberFormat $pFormat
<      *


     * @return bool
     */

<     public static function isDateTimeFormat(NumberFormat $pFormat)



>     public static function isDateTimeFormat(NumberFormat $excelFormatCode)


    {

<         return self::isDateTimeFormatCode($pFormat->getFormatCode());



>         return self::isDateTimeFormatCode($excelFormatCode->getFormatCode());


    }

    private static $possibleDateFormatCharacters = 'eymdHs';

    /**
     * Is a given number format code a date/time?
     *

<      * @param string $pFormatCode



>      * @param string $excelFormatCode


     *
     * @return bool
     */

<     public static function isDateTimeFormatCode($pFormatCode)



>     public static function isDateTimeFormatCode($excelFormatCode)


    {

<         if (strtolower($pFormatCode) === strtolower(NumberFormat::FORMAT_GENERAL)) {



>         if (strtolower($excelFormatCode) === strtolower(NumberFormat::FORMAT_GENERAL)) {


            //    "General" contains an epoch letter 'e', so we trap for it explicitly here (case-insensitive check)
            return false;
        }

<         if (preg_match('/[0#]E[+-]0/i', $pFormatCode)) {



>         if (preg_match('/[0#]E[+-]0/i', $excelFormatCode)) {


            //    Scientific format
            return false;
        }

        // Switch on formatcode

<         switch ($pFormatCode) {



>         switch ($excelFormatCode) {


            //    Explicitly defined date formats
            case NumberFormat::FORMAT_DATE_YYYYMMDD:
            case NumberFormat::FORMAT_DATE_YYYYMMDD2:
            case NumberFormat::FORMAT_DATE_DDMMYYYY:
            case NumberFormat::FORMAT_DATE_DMYSLASH:
            case NumberFormat::FORMAT_DATE_DMYMINUS:
            case NumberFormat::FORMAT_DATE_DMMINUS:
            case NumberFormat::FORMAT_DATE_MYMINUS:
            case NumberFormat::FORMAT_DATE_DATETIME:
            case NumberFormat::FORMAT_DATE_TIME1:
            case NumberFormat::FORMAT_DATE_TIME2:
            case NumberFormat::FORMAT_DATE_TIME3:
            case NumberFormat::FORMAT_DATE_TIME4:
            case NumberFormat::FORMAT_DATE_TIME5:
            case NumberFormat::FORMAT_DATE_TIME6:
            case NumberFormat::FORMAT_DATE_TIME7:
            case NumberFormat::FORMAT_DATE_TIME8:
            case NumberFormat::FORMAT_DATE_YYYYMMDDSLASH:
            case NumberFormat::FORMAT_DATE_XLSX14:
            case NumberFormat::FORMAT_DATE_XLSX15:
            case NumberFormat::FORMAT_DATE_XLSX16:
            case NumberFormat::FORMAT_DATE_XLSX17:
            case NumberFormat::FORMAT_DATE_XLSX22:
                return true;
        }

        //    Typically number, currency or accounting (or occasionally fraction) formats

<         if ((substr($pFormatCode, 0, 1) == '_') || (substr($pFormatCode, 0, 2) == '0 ')) {



>         if ((substr($excelFormatCode, 0, 1) == '_') || (substr($excelFormatCode, 0, 2) == '0 ')) {
>             return false;
>         }
>         // Some "special formats" provided in German Excel versions were detected as date time value,
>         // so filter them out here - "\C\H\-00000" (Switzerland) and "\D-00000" (Germany).
>         if (\strpos($excelFormatCode, '-00000') !== false) {


            return false;
        }
        // Try checking for any of the date formatting characters that don't appear within square braces

<         if (preg_match('/(^|\])[^\[]*[' . self::$possibleDateFormatCharacters . ']/i', $pFormatCode)) {



>         if (preg_match('/(^|\])[^\[]*[' . self::$possibleDateFormatCharacters . ']/i', $excelFormatCode)) {


            //    We might also have a format mask containing quoted strings...
            //        we don't want to test for any of our characters within the quoted blocks

<             if (strpos($pFormatCode, '"') !== false) {



>             if (strpos($excelFormatCode, '"') !== false) {


                $segMatcher = false;

<                 foreach (explode('"', $pFormatCode) as $subVal) {



>                 foreach (explode('"', $excelFormatCode) as $subVal) {


                    //    Only test in alternate array entries (the non-quoted blocks)

<                     if (($segMatcher = !$segMatcher) &&
<                         (preg_match('/(^|\])[^\[]*[' . self::$possibleDateFormatCharacters . ']/i', $subVal))) {



>                     if (
>                         ($segMatcher = !$segMatcher) &&
>                         (preg_match('/(^|\])[^\[]*[' . self::$possibleDateFormatCharacters . ']/i', $subVal))
>                     ) {


                        return true;
                    }
                }

                return false;
            }

            return true;
        }

        // No date...
        return false;
    }

    /**
     * Convert a date/time string to Excel time.
     *
     * @param string $dateValue Examples: '2009-12-31', '2009-12-31 15:59', '2009-12-31 15:59:10'
     *
     * @return false|float Excel date/time serial value
     */
    public static function stringToExcel($dateValue)
    {
        if (strlen($dateValue) < 2) {
            return false;
        }
        if (!preg_match('/^(\d{1,4}[ \.\/\-][A-Z]{3,9}([ \.\/\-]\d{1,4})?|[A-Z]{3,9}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?|\d{1,4}[ \.\/\-]\d{1,4}([ \.\/\-]\d{1,4})?)( \d{1,2}:\d{1,2}(:\d{1,2})?)?$/iu', $dateValue)) {
            return false;
        }


<         $dateValueNew = DateTime::DATEVALUE($dateValue);



>         $dateValueNew = DateTimeExcel\DateValue::fromString($dateValue);



        if ($dateValueNew === Functions::VALUE()) {
            return false;
        }

        if (strpos($dateValue, ':') !== false) {

<             $timeValue = DateTime::TIMEVALUE($dateValue);



>             $timeValue = DateTimeExcel\TimeValue::fromString($dateValue);


            if ($timeValue === Functions::VALUE()) {
                return false;
            }
            $dateValueNew += $timeValue;
        }

        return $dateValueNew;
    }

    /**
     * Converts a month name (either a long or a short name) to a month number.
     *

<      * @param string $month Month name or abbreviation



>      * @param string $monthName Month name or abbreviation


     *
     * @return int|string Month number (1 - 12), or the original string argument if it isn't a valid month name
     */

<     public static function monthStringToNumber($month)



>     public static function monthStringToNumber($monthName)


    {
        $monthIndex = 1;
        foreach (self::$monthNames as $shortMonthName => $longMonthName) {

<             if (($month === $longMonthName) || ($month === $shortMonthName)) {



>             if (($monthName === $longMonthName) || ($monthName === $shortMonthName)) {


                return $monthIndex;
            }
            ++$monthIndex;
        }


<         return $month;



>         return $monthName;


    }

    /**
     * Strips an ordinal from a numeric value.
     *
     * @param string $day Day number with an ordinal
     *
     * @return int|string The integer value with any ordinal stripped, or the original string argument if it isn't a valid numeric
     */
    public static function dayStringToNumber($day)
    {
        $strippedDayValue = (str_replace(self::$numberSuffixes, '', $day));
        if (is_numeric($strippedDayValue)) {
            return (int) $strippedDayValue;
        }

        return $day;

>     }
    }
> 
}
>     public static function dateTimeFromTimestamp(string $date, ?DateTimeZone $timeZone = null): DateTime
>     {
>         $dtobj = DateTime::createFromFormat('U', $date) ?: new DateTime();
>         $dtobj->setTimeZone($timeZone ?? self::getDefaultOrLocalTimezone());
> 
>         return $dtobj;
>     }
> 
>     public static function formattedDateTimeFromTimestamp(string $date, string $format, ?DateTimeZone $timeZone = null): string
>     {
>         $dtobj = self::dateTimeFromTimestamp($date, $timeZone);
> 
>         return $dtobj->format($format);