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<?php
/**
 * Jalali (Shamsi) DateTime Class. Supports years higher than 2038.
 *
 * Copyright (c) 2012 Sallar Kaboli <sallar.kaboli@gmail.com>
 * http://sallar.me
 *
 * The MIT License (MIT)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * 1- The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * 2- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Original Jalali to Gregorian (and vice versa) convertor:
 * Copyright (C) 2000  Roozbeh Pournader and Mohammad Toossi
 *
 * List of supported timezones can be found here:
 * http://www.php.net/manual/en/timezones.php
 *
 *
 * @package    jDateTime
 * @author     Sallar Kaboli <sallar.kaboli@gmail.com>
 * @author     Omid Pilevar <omid.pixel@gmail.com>
 * @copyright  2003-2012 Sallar Kaboli
 * @license    http://opensource.org/licenses/mit-license.php The MIT License
 * @link       https://github.com/sallar/jDateTime
 * @see        DateTime
 * @version    2.2.0
 */
class jDateTime
{

/**
     * Defaults
     */
    private static $jalali   = true; //Use Jalali Date, If set to false, falls back to gregorian
    private static $convert  = true; //Convert numbers to Farsi characters in utf-8
    private static $timezone = null; //Timezone String e.g Asia/Tehran, Defaults to Server Timezone Settings
    private static $temp = array();

/**
     * jDateTime::Constructor
     *
     * Pass these parameteres when creating a new instance
     * of this Class, and they will be used as defaults.
     * e.g $obj = new jDateTime(false, true, 'Asia/Tehran');
     * To use system defaults pass null for each one or just
     * create the object without any parameters.
     *
     * @author Sallar Kaboli
     * @param $convert bool Converts numbers to Farsi
     * @param $jalali bool Converts date to Jalali
     * @param $timezone string Timezone string
     */
    public function __construct($convert = null, $jalali = null, $timezone = null)
    {
        if ( $jalali   !== null ) self::$jalali   = (bool) $jalali;
        if ( $convert  !== null ) self::$convert  = (bool) $convert;
        if ( $timezone !== null ) self::$timezone = $timezone;
    }

/**
     * Convert a formatted string from Georgian Calendar to Jalali Calendar.
     * This will be useful to directly convert time strings coming from databases.
     * Example:
     *
     *  // Suppose this comes from database
     *  $a = '2016-02-14 14:20:38';
     *  $date = \jDateTime::convertFormatToFormat('Y-m-d H:i:s', 'Y-m-d H:i:s', $a);
     *  // $date will now be '۱۳۹۴-۱۱-۲۵ ۱۴:۲۰:۳۸'
     *
     * @author Vahid Fazlollahzade
     * @param string $jalaliFormat Return format. Same as static::date(...)
     * @param string $georgianFormat The format of $timeString. See php.net/date
     * @param string $timeString The time itself, formatted as $georgianFormat
     * @param null|\DateTimeZone|string $timezone The timezone. Same as static::date(...)
     * @return string
     */
    public static function convertFormatToFormat($jalaliFormat, $georgianFormat, $timeString, $timezone=null)
    {
        // Normalize $timezone, take from static::date(...)
        $timezone = ($timezone != null) ? $timezone : ((self::$timezone != null) ? self::$timezone : date_default_timezone_get());
        if (is_string($timezone)) {
            $timezone = new \DateTimeZone($timezone);
        } elseif (!$timezone instanceof \DateTimeZone) {
            throw new \RuntimeException('Provided timezone is not correct.');
        }

// Convert to timestamp, then to Jalali
        $datetime = \DateTime::createFromFormat($georgianFormat, $timeString, $timezone);
        return static::date($jalaliFormat, $datetime->getTimestamp());
    }

/**
     * jDateTime::Date
     *
     * Formats and returns given timestamp just like php's
     * built in date() function.
     * e.g:
     * $obj->date("Y-m-d H:i", time());
     * $obj->date("Y-m-d", time(), false, false, 'America/New_York');
     *
     * @author Sallar Kaboli
     * @param $format string Acceps format string based on: php.net/date
     * @param $stamp int Unix Timestamp (Epoch Time)
     * @param $convert bool (Optional) forces convert action. pass null to use system default
     * @param $jalali bool (Optional) forces jalali conversion. pass null to use system default
     * @param $timezone string (Optional) forces a different timezone. pass null to use system default
     * @return string Formatted input
     */
    public static function date($format, $stamp = false, $convert = null, $jalali = null, $timezone = null)
    {
        //Timestamp + Timezone
        $stamp    = ($stamp !== false) ? $stamp : time();
        $timezone = ($timezone != null) ? $timezone : ((self::$timezone != null) ? self::$timezone : date_default_timezone_get());
        $obj      = new DateTime('@' . $stamp, new DateTimeZone($timezone));
        $obj->setTimezone(new DateTimeZone($timezone));

if ( (self::$jalali === false && $jalali === null) || $jalali === false ) {
            return $obj->format($format);
        }
        else {
            
            //Find what to replace
            $chars  = (preg_match_all('/([a-zA-Z]{1})/', $format, $chars)) ? $chars[0] : array();
            
            //Intact Keys
            $intact = array('B','h','H','g','G','i','s','I','U','u','Z','O','P');
            $intact = self::filterArray($chars, $intact);
            $intactValues = array();

foreach ($intact as $k => $v) {
                $intactValues[$k] = $obj->format($v);
            }
            //End Intact Keys

//Changed Keys
            list($year, $month, $day) = array($obj->format('Y'), $obj->format('n'), $obj->format('j'));
            list($jyear, $jmonth, $jday) = self::toJalali($year, $month, $day);

$keys   = array('d','D','j','l','N','S','w','z','W','F','m','M','n','t','L','o','Y','y','a','A','c','r','e','T');
            $keys   = self::filterArray($chars, $keys, array('z'));
            $values = array();

foreach ($keys as $k => $key) {

$v = '';
                switch ($key) {
                    //Day
                    case 'd':
                        $v = sprintf('%02d', $jday);
                        break;
                    case 'D':
                        $v = self::getDayNames($obj->format('D'), true);
                        break;
                    case 'j':
                        $v = $jday;
                        break;
                    case 'l':
                        $v = self::getDayNames($obj->format('l'));
                        break;
                    case 'N':
                        $v = self::getDayNames($obj->format('l'), false, 1, true);
                        break;
                    case 'S':
                        $v = 'ام';
                        break;
                    case 'w':
                        $v = self::getDayNames($obj->format('l'), false, 1, true) - 1;
                        break;
                    case 'z':
                        if ($jmonth > 6) {
                            $v = 186 + (($jmonth - 6 - 1) * 30) + $jday;
                        }
                        else {
                            $v = (($jmonth - 1) * 31) + $jday;
                        }
                        self::$temp['z'] = $v;
                        break;
                    //Week
                    case 'W':
                        $v = is_int(self::$temp['z'] / 7) ? (self::$temp['z'] / 7) : intval(self::$temp['z'] / 7 + 1);
                        break;
                    //Month
                    case 'F':
                        $v = self::getMonthNames($jmonth);
                        break;
                    case 'm':
                        $v = sprintf('%02d', $jmonth);
                        break;
                    case 'M':
                        $v = self::getMonthNames($jmonth, true);
                        break;
                    case 'n':
                        $v = $jmonth;
                        break;
                    case 't':
                    	if ($jmonth>=1 && $jmonth<=6) $v=31;
                    	else if ($jmonth>=7 && $jmonth<=11) $v=30;
                    	else if($jmonth==12 && $jyear % 4 ==3) $v=30;
                    	else if ($jmonth==12 && $jyear % 4 !=3) $v=29;
                        break;
                    //Year
                    case 'L':
                        $tmpObj = new DateTime('@'.(time()-31536000));
                        $v = $tmpObj->format('L');
                        break;
                    case 'o':
                    case 'Y':
                        $v = $jyear;
                        break;
                    case 'y':
                        $v = $jyear % 100;
                        break;
                    //Time
                    case 'a':
                        $v = ($obj->format('a') == 'am') ? 'ق.ظ' : 'ب.ظ';
                        break;
                    case 'A':
                        $v = ($obj->format('A') == 'AM') ? 'قبل از ظهر' : 'بعد از ظهر';
                        break;
                    //Full Dates
                    case 'c':
                        $v  = $jyear.'-'.sprintf('%02d', $jmonth).'-'.sprintf('%02d', $jday).'T';
                        $v .= $obj->format('H').':'.$obj->format('i').':'.$obj->format('s').$obj->format('P');
                        break;
                    case 'r':
                        $v  = self::getDayNames($obj->format('D'), true).', '.sprintf('%02d', $jday).' '.self::getMonthNames($jmonth, true);
                        $v .= ' '.$jyear.' '.$obj->format('H').':'.$obj->format('i').':'.$obj->format('s').' '.$obj->format('P');
                        break;
                    //Timezone
                    case 'e':
                        $v = $obj->format('e');
                        break;
                    case 'T':
                        $v = $obj->format('T');
                        break;

}
                $values[$k] = $v;

}
            //End Changed Keys

//Merge
            $keys   = array_merge($intact, $keys);
            $values = array_merge($intactValues, $values);

//Return
            $ret = strtr($format, array_combine($keys, $values));
            return
                ($convert === false ||
                ($convert === null && self::$convert === false) ||
                ( $jalali === false || $jalali === null && self::$jalali === false ))
                ? $ret : self::convertNumbers($ret);

}

/**
     * jDateTime::gDate
     *
     * Same as jDateTime::Date method
     * but this one works as a helper and returns Gregorian Date
     * in case someone doesn't like to pass all those false arguments
     * to Date method.
     *
     * e.g. $obj->gDate("Y-m-d") //Outputs: 2011-05-05
     *      $obj->date("Y-m-d", false, false, false); //Outputs: 2011-05-05
     *      Both return the exact same result.
     *
     * @author Sallar Kaboli
     * @param $format string Acceps format string based on: php.net/date
     * @param $stamp int Unix Timestamp (Epoch Time)
     * @param $timezone string (Optional) forces a different timezone. pass null to use system default
     * @return string Formatted input
     */
    public static function gDate($format, $stamp = false, $timezone = null)
    {
        return self::date($format, $stamp, false, false, $timezone);
    }
    
    /**
     * jDateTime::Strftime
     *
     * Format a local time/date according to locale settings
     * built in strftime() function.
     * e.g:
     * $obj->strftime("%x %H", time());
     * $obj->strftime("%H", time(), false, false, 'America/New_York');
     *
     * @author Omid Pilevar
     * @param $format string Acceps format string based on: php.net/date
     * @param $stamp int Unix Timestamp (Epoch Time)
     * @param $convert bool (Optional) forces convert action. pass null to use system default
     * @param $jalali bool (Optional) forces jalali conversion. pass null to use system default
     * @param $timezone string (Optional) forces a different timezone. pass null to use system default
     * @return string Formatted input
     */
    public static function strftime($format, $stamp = false, $convert = null, $jalali = null, $timezone = null)
    {
        $str_format_code = array(
            '%a', '%A', '%d', '%e', '%j', '%u', '%w',
            '%U', '%V', '%W',
            '%b', '%B', '%h', '%m',
            '%C', '%g', '%G', '%y', '%Y',
            '%H', '%I', '%l', '%M', '%p', '%P', '%r', '%R', '%S', '%T', '%X', '%z', '%Z',
            '%c', '%D', '%F', '%s', '%x',
            '%n', '%t', '%%'
        );
        
        $date_format_code = array(
            'D', 'l', 'd', 'j', 'z', 'N', 'w',
            'W', 'W', 'W',
            'M', 'F', 'M', 'm',
            'y', 'y', 'y', 'y', 'Y',
            'H', 'h', 'g', 'i', 'A', 'a', 'h:i:s A', 'H:i', 's', 'H:i:s', 'h:i:s', 'H', 'H',
            'D j M H:i:s', 'd/m/y', 'Y-m-d', 'U', 'd/m/y',
            '\n', '\t', '%'
        );

//Change Strftime format to Date format
        $format = str_replace($str_format_code, $date_format_code, $format);

//Convert to date
        return self::date($format, $stamp, $convert, $jalali, $timezone);
    }
	
   /**
     * jDateTime::Mktime
     *
     * Creates a Unix Timestamp (Epoch Time) based on given parameters
     * works like php's built in mktime() function.
     * e.g:
     * $time = $obj->mktime(0,0,0,2,10,1368);
     * $obj->date("Y-m-d", $time); //Format and Display
     * $obj->date("Y-m-d", $time, false, false); //Display in Gregorian !
     *
     * You can force gregorian mktime if system default is jalali and you
     * need to create a timestamp based on gregorian date
     * $time2 = $obj->mktime(0,0,0,12,23,1989, false);
     *
     * @author Sallar Kaboli
     * @param $hour int Hour based on 24 hour system
     * @param $minute int Minutes
     * @param $second int Seconds
     * @param $month int Month Number
     * @param $day int Day Number
     * @param $year int Four-digit Year number eg. 1390
     * @param $jalali bool (Optional) pass false if you want to input gregorian time
     * @param $timezone string (Optional) acceps an optional timezone if you want one
     * @return int Unix Timestamp (Epoch Time)
     */
    public static function mktime($hour, $minute, $second, $month, $day, $year, $jalali = null, $timezone = null)
    {
        //Defaults
        $month = (intval($month) == 0) ? self::date('m') : $month;
        $day   = (intval($day)   == 0) ? self::date('d') : $day;
        $year  = (intval($year)  == 0) ? self::date('Y') : $year;
        $hour  = intval($hour);
        $minute  = intval($minute);
        $second  = intval($second);

//Convert to Gregorian if necessary
        if ( $jalali === true || ($jalali === null && self::$jalali === true) ) {
            list($year, $month, $day) = self::toGregorian($year, $month, $day);
        }

//Create a new object and set the timezone if available
        $date = $year.'-'.sprintf('%02d', $month).'-'.sprintf('%02d', $day).' '.$hour.':'.$minute.':'.$second;

if ( self::$timezone != null || $timezone != null ) {
            $obj = new DateTime($date, new DateTimeZone(($timezone != null) ? $timezone : self::$timezone));
        }
        else {
            $obj = new DateTime($date);
        }

//Return
        return $obj->format('U');
    }
    
    /**
     * jDateTime::Checkdate
     *
     * Checks the validity of the date formed by the arguments.
     * A date is considered valid if each parameter is properly defined.
     * works like php's built in checkdate() function.
     * Leap years are taken into consideration.
     * e.g:
     * $obj->checkdate(10, 21, 1390); // Return true
     * $obj->checkdate(9, 31, 1390);  // Return false
     *
     * You can force gregorian checkdate if system default is jalali and you
     * need to check based on gregorian date
     * $check = $obj->checkdate(12, 31, 2011, false);
     *
     * @author Omid Pilevar
     * @param $month int The month is between 1 and 12 inclusive.
     * @param $day int The day is within the allowed number of days for the given month.
     * @param $year int The year is between 1 and 32767 inclusive.
     * @param $jalali bool (Optional) pass false if you want to input gregorian time
     * @return bool
     */
    public static function checkdate($month, $day, $year, $jalali = null)
    {
        //Defaults
        $month = (intval($month) == 0) ? self::date('n') : intval($month);
        $day   = (intval($day)   == 0) ? self::date('j') : intval($day);
        $year  = (intval($year)  == 0) ? self::date('Y') : intval($year);
        
        //Check if its jalali date
        if ( $jalali === true || ($jalali === null && self::$jalali === true) )
        {
            $epoch = self::mktime(0, 0, 0, $month, $day, $year);
            
            if( self::date('Y-n-j', $epoch,false) == "$year-$month-$day" ) {
                $ret = true;
            }
            else{
                $ret = false; 
            }
        }
        else //Gregorian Date
        { 
            $ret = checkdate($month, $day, $year);
        }
        
        //Return
        return $ret;
    }
    
    /**
     * jDateTime::getdate
     *
     * Like php built-in function, returns an associative array containing the date information of a timestamp, or the current local time if no timestamp is given. .
     *
     * @author Meysam Pour Ganji
     * @param $timestamp int The timestamp that whould convert to date information array, if NULL passed, current timestamp will be processed.
     * @return An associative array of information related to the timestamp. For see elements of the returned associative array see {@link http://php.net/manual/en/function.getdate.php#refsect1-function.getdate-returnvalues}.
     */
    public static function getdate($timestamp = null)
    {
        if ( $timestamp === null )
        {
            $timestamp = time();
        }
        
        if ( is_string($timestamp) )
        {
            if( ctype_digit($timestamp) || ( $timestamp{0} == '-' && ctype_digit(substr($timestamp, 1)) ) )
            {
                $timestamp = (int)$timestamp;
            }
            else
            {
                $timestamp = strtotime($timestamp);
            }
        }
        
        $dateString = self::date("s|i|G|j|w|n|Y|z|l|F", $timestamp);
        $dateArray = explode("|", $dateString);
        
        $result = array(
            "seconds" => $dateArray[0],
            "minutes" => $dateArray[1],
            "hours" => $dateArray[2],
            "mday" => $dateArray[3],
            "wday" => $dateArray[4],
            "mon" => $dateArray[5],
            "year" => $dateArray[6],
            "yday" => $dateArray[7],
            "weekday" => $dateArray[8],
            "month" => $dateArray[9],
            0 => $timestamp
        ); 
        
        return $result;
    }

/**
     * System Helpers below
     * ------------------------------------------------------
     */
    
    /**
     * Filters out an array
     */
    private static function filterArray($needle, $heystack, $always = array())
    {
        return array_intersect(array_merge($needle, $always), $heystack);
    }
    
    /**
     * Returns correct names for week days
     */
    private static function getDayNames($day, $shorten = false, $len = 1, $numeric = false)
    {
        $days = array(
            'sat' => array(1, 'شنبه'),
            'sun' => array(2, 'یکشنبه'),
            'mon' => array(3, 'دوشنبه'),
            'tue' => array(4, 'سه شنبه'),
            'wed' => array(5, 'چهارشنبه'),
            'thu' => array(6, 'پنجشنبه'),
            'fri' => array(7, 'جمعه')
        );

$day = substr(strtolower($day), 0, 3);
        $day = $days[$day];

return ($numeric) ? $day[0] : (($shorten) ? self::substr($day[1], 0, $len) : $day[1]);
    }

/**
     * Returns correct names for months
     */
    private static function getMonthNames($month, $shorten = false, $len = 3)
    {
        // Convert
        $months = array(
            'فروردین', 'اردیبهشت', 'خرداد', 'تیر', 'مرداد', 'شهریور', 'مهر', 'آبان', 'آذر', 'دی', 'بهمن', 'اسفند'
        );
        $ret    = $months[$month - 1];

// Return
        return ($shorten) ? self::substr($ret, 0, $len) : $ret;
    }

/**
     * Converts latin numbers to farsi script
     */
    private static function convertNumbers($matches)
    {
        $farsi_array   = array('۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹');
        $english_array = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');

return str_replace($english_array, $farsi_array, $matches);
    }

/**
     * Division
     */
    private static function div($a, $b)
    {
        return (int) ($a / $b);
    }

/**
     * Substring helper
     */
    private static function substr($str, $start, $len)
    {
        if( function_exists('mb_substr') ){
            return mb_substr($str, $start, $len, 'UTF-8');
        }
        else{
            return substr($str, $start, $len * 2);
        }
    }

/**
     * Gregorian to Jalali Conversion
     * Copyright (C) 2000  Roozbeh Pournader and Mohammad Toossi
     */
    public static function toJalali($g_y, $g_m, $g_d)
    {

$g_days_in_month = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
        $j_days_in_month = array(31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29);

$gy = $g_y-1600;
        $gm = $g_m-1;
        $gd = $g_d-1;

$g_day_no = 365*$gy+self::div($gy+3, 4)-self::div($gy+99, 100)+self::div($gy+399, 400);

for ($i=0; $i < $gm; ++$i)
            $g_day_no += $g_days_in_month[$i];
        if ($gm>1 && (($gy%4==0 && $gy%100!=0) || ($gy%400==0)))
            $g_day_no++;
        $g_day_no += $gd;

$j_day_no = $g_day_no-79;

$j_np = self::div($j_day_no, 12053);
        $j_day_no = $j_day_no % 12053;

$jy = 979+33*$j_np+4*self::div($j_day_no, 1461);

$j_day_no %= 1461;

if ($j_day_no >= 366) {
            $jy += self::div($j_day_no-1, 365);
            $j_day_no = ($j_day_no-1)%365;
        }

for ($i = 0; $i < 11 && $j_day_no >= $j_days_in_month[$i]; ++$i)
            $j_day_no -= $j_days_in_month[$i];
        $jm = $i+1;
        $jd = $j_day_no+1;

return array($jy, $jm, $jd);

}

/**
     * Jalali to Gregorian Conversion
     * Copyright (C) 2000  Roozbeh Pournader and Mohammad Toossi
     *
     */
    public static function toGregorian($j_y, $j_m, $j_d)
    {

$g_days_in_month = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
        $j_days_in_month = array(31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29);

$jy = $j_y-979;
        $jm = $j_m-1;
        $jd = $j_d-1;

$j_day_no = 365*$jy + self::div($jy, 33)*8 + self::div($jy%33+3, 4);
        for ($i=0; $i < $jm; ++$i)
            $j_day_no += $j_days_in_month[$i];

$j_day_no += $jd;

$g_day_no = $j_day_no+79;

$gy = 1600 + 400*self::div($g_day_no, 146097);
        $g_day_no = $g_day_no % 146097;

$leap = true;
        if ($g_day_no >= 36525) {
            $g_day_no--;
            $gy += 100*self::div($g_day_no,  36524);
            $g_day_no = $g_day_no % 36524;

if ($g_day_no >= 365)
                $g_day_no++;
            else
                $leap = false;
        }

$gy += 4*self::div($g_day_no, 1461);
        $g_day_no %= 1461;

if ($g_day_no >= 366) {
            $leap = false;

$g_day_no--;
            $gy += self::div($g_day_no, 365);
            $g_day_no = $g_day_no % 365;
        }

for ($i = 0; $g_day_no >= $g_days_in_month[$i] + ($i == 1 && $leap); $i++)
            $g_day_no -= $g_days_in_month[$i] + ($i == 1 && $leap);
        $gm = $i+1;
        $gd = $g_day_no+1;

return array($gy, $gm, $gd);

}