change base time function to persian calender

hi
i have an php script to change english data to persion ( ex: now is yers 1386 in iran calender an ( اردیبهشت)
month
this is:
jdf.php file:

<?php
/*
Jalali Date function by Milad Rastian (miladmovie AT yahoo DOT com)

//The main function which convert Gregorian to Jalali calendars is:
// Copyright (C) 2000  Roozbeh Pournader and Mohammad Toossi
//you can see complete note of those function in down of the page

		AND JALAI DATE FUNCTION
this function is simillar than date function in PHP
you can find more about it in http://jdf.farsiprojects.com
		Copyright (C)2003 FARSI PROJECTS GROUP

         //   //\\           //        //\\           //          //////
        //   //  \\         //        //  \\         //            //
       //   //    \\       //        //    \\       //            //
  \\  //   /////\\\\\     //        /////\\\\\     //            //
   \\//   //        \\   ///////   //        \\   //////////   /////

    ///////      //\\         //////   ////////
   //     //    //  \\         //     //
  //     //    //    \\       //     ///////
 //     //    /////\\\\\     //     //
////////     //        \\   //     /////////

*/

// lang file must be at the same directory
include_once("lang_jdf.php");

function jdate($type,$maket="now")
{
	$result="";
	if($maket=="now"){
		$year=date("Y");
		$month=date("m");
		$day=date("d");
		list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
		$maket=jmaketime(date("h")+_JDF_TZhours,date("i")+_JDF_TZminute,date("s"),$jmonth,$jday,$jyear);
	}else{
		$maket+=_JDF_TZhours*3600+_JDF_TZminute*60;
		$date=date("Y-m-d",$maket);
		list( $year, $month, $day ) = preg_split ( '/-/', $date );

		list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
		}

	$need= $maket;
	$year=date("Y",$need);
	$month=date("m",$need);
	$day=date("d",$need);
	$i=0;
	while($i<strlen($type))
	{
		$subtype=substr($type,$i,1);
		switch ($subtype)
		{

			case "A":
				$result1=date("a",$need);
				if($result1=="pm") $result.=_JDF_PM_LONG;
				else $result.=_JDF_AM_LONG;
				break;

			case "a":
				$result1=date("a",$need);
				if($result1=="pm") $result.=_JDF_PM_SHORT;
				else $result.=_JDF_AM_SHORT;
				break;
			case "d":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				if($jday<10)$result1="0".$jday;
				else 	$result1=$jday;
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "D":
				$result1=date("D",$need);
				if($result1=="Sat") $result1=_JDF_Sat_SHORT;
				else if($result1=="Sun") $result1=_JDF_Sun_SHORT;
				else if($result1=="Mon") $result1=_JDF_Mon_SHORT;
				else if($result1=="Tue") $result1=_JDF_Tue_SHORT;
				else if($result1=="Wed") $result1=_JDF_Wed_SHORT;
				else if($result1=="Thu") $result1=_JDF_Thu_SHORT;
                                else if($result1=="Fri") $result1=_JDF_Fri_SHORT;
				$result.=$result1;
				break;
			case"F":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result.=monthname($jmonth);
				break;
			case "g":
				$result1=date("g",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "G":
				$result1=date("G",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
				case "h":
				$result1=date("h",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "H":
				$result1=date("H",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "i":
				$result1=date("i",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "j":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result1=$jday;
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "l":
				$result1=date("l",$need);
				if($result1=="Saturday") $result1=_JDF_Sat_LONG;
				else if($result1=="Sunday") $result1=_JDF_Sun_LONG;
				else if($result1=="Monday") $result1=_JDF_Mon_LONG;
				else if($result1=="Tuesday") $result1=_JDF_Tue_LONG;
				else if($result1=="Wednesday") $result1=_JDF_Wed_LONG;
				else if($result1=="Thursday") $result1=_JDF_Thu_LONG;
				else if($result1=="Friday") $result1=_JDF_Fri_LONG;
				$result.=$result1;
				break;
			case "m":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				if($jmonth<10) $result1="0".$jmonth;
				else	$result1=$jmonth;
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "M":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result.=monthname($jmonth);
				break;
			case "n":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result1=$jmonth;
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "s":
				$result1=date("s",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "S":
				$result.=_JDF_Suffix;
				break;
			case "t":
				$result.=lastday ($month,$day,$year);
				break;
			case "w":
				$result1=date("w",$need);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "y":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result1=substr($jyear,2,4);
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			case "Y":
				list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
				$result1=$jyear;
				if(_JDF_USE_PERSIANNUM) $result.=Convertnumber2farsi($result1);
				else $result.=$result1;
				break;
			default:
				$result.=$subtype;
		}
	$i++;
	}
	return $result;
}



function jmaketime($hour,$minute,$second,$jmonth,$jday,$jyear)
{
	list( $year, $month, $day ) = jalali_to_gregorian($jyear, $jmonth, $jday);
	$i=mktime($hour,$minute,$second,$month,$day,$year);
	return $i;
}


///Find Day Begining Of Month
function mstart($month,$day,$year)
{
	list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
	list( $year, $month, $day ) = jalali_to_gregorian($jyear, $jmonth, "1");
	$timestamp=mktime(0,0,0,$month,$day,$year);
	return date("w",$timestamp);
}

//Find Number Of Days In This Month
function lastday ($month,$day,$year)
{
	$lastdayen=date("d",mktime(0,0,0,$month+1,0,$year));
	list( $jyear, $jmonth, $jday ) = gregorian_to_jalali($year, $month, $day);
	$lastdatep=$jday;
	$jday=$jday2;
	while($jday2!="1")
	{
		if($day<$lastdayen)
		{
			$day++;
			list( $jyear, $jmonth, $jday2 ) = gregorian_to_jalali($year, $month, $day);
			if($jdate2=="1") break;
			if($jdate2!="1") $lastdatep++;
		}
		else
		{
			$day=0;
			$month++;
			if($month==13)
			{
					$month="1";
					$year++;
			}
		}

	}
	return $lastdatep-1;
}

//translate number of month to name of month
function monthname($month)
{

    if($month=="01") return _JDF_Far;

    if($month=="02") return _JDF_Ord;

    if($month=="03") return _JDF_Kho;

    if($month=="04") return _JDF_Tir;

    if($month=="05") return _JDF_Mor;

    if($month=="06") return _JDF_Sha;

    if($month=="07") return _JDF_Meh;

    if($month=="08") return _JDF_Aba;

    if($month=="09") return _JDF_Aza;

    if($month=="10") return _JDF_Dey;

    if($month=="11") return _JDF_Bah;

    if($month=="12") return _JDF_Esf;
}

////here convert to  number in persian
function Convertnumber2farsi($srting)
{
	$stringtemp="";
	$len=strlen($srting);
	for($sub=0;$sub<$len;$sub++)
	{
	 if(substr($srting,$sub,1)=="0")$stringtemp.=_JDF_Num0;
	 elseif(substr($srting,$sub,1)=="1")$stringtemp.=_JDF_Num1;
	 elseif(substr($srting,$sub,1)=="2")$stringtemp.=_JDF_Num2;
	 elseif(substr($srting,$sub,1)=="3")$stringtemp.=_JDF_Num3;
	 elseif(substr($srting,$sub,1)=="4")$stringtemp.=_JDF_Num4;
	 elseif(substr($srting,$sub,1)=="5")$stringtemp.=_JDF_Num5;
	 elseif(substr($srting,$sub,1)=="6")$stringtemp.=_JDF_Num6;
	 elseif(substr($srting,$sub,1)=="7")$stringtemp.=_JDF_Num7;
	 elseif(substr($srting,$sub,1)=="8")$stringtemp.=_JDF_Num8;
	 elseif(substr($srting,$sub,1)=="9")$stringtemp.=_JDF_Num9;
	 else {$stringtemp.=substr($srting,$sub,2);$sub++;}

	}
return   $stringtemp;

}///end convert to number in persian


////here convert to  number in english
function Convertnumber2english($srting)
{
	$stringtemp="";
	$len=strlen($srting);

	for($sub=0;$sub<$len;$sub+=2)
	{
	 if(substr($srting,$sub,2)==_JDF_Num0)$stringtemp.="0";
	 elseif(substr($srting,$sub,2)==_JDF_Num1)$stringtemp.="1";
	 elseif(substr($srting,$sub,2)==_JDF_Num2)$stringtemp.="2";
	 elseif(substr($srting,$sub,2)==_JDF_Num3)$stringtemp.="3";
         elseif(substr($srting,$sub,2)==_JDF_Num4)$stringtemp.="4";
	 elseif(substr($srting,$sub,2)==_JDF_Num5)$stringtemp.="5";
	 elseif(substr($srting,$sub,2)==_JDF_Num6)$stringtemp.="6";
	 elseif(substr($srting,$sub,2)==_JDF_Num7)$stringtemp.="7";
	 elseif(substr($srting,$sub,2)==_JDF_Num8)$stringtemp.="8";
	 elseif(substr($srting,$sub,2)==_JDF_Num9)$stringtemp.="9";
	 else {$stringtemp.=substr($srting,$sub,1);$sub--;}
     }
return   $stringtemp;

}///end convert to number in english


// "jalali.php" is convertor to and from Gregorian and Jalali calendars.
// Copyright (C) 2000  Roozbeh Pournader and Mohammad Toossi
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// A copy of the GNU General Public License is available from:
//
//    <a href="http://www.gnu.org/copyleft/gpl.html" target="_blank">http://www.gnu.org/copyleft/gpl.html</a>
//


function div($a,$b) {
    return (int) ($a / $b);
}

function gregorian_to_jalali ($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+div($gy+3,4)-div($gy+99,100)+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)))
      /* leap and after Feb */
      $g_day_no++;
   $g_day_no += $gd;

   $j_day_no = $g_day_no-79;

   $j_np = div($j_day_no, 12053); /* 12053 = 365*33 + 32/4 */
   $j_day_no = $j_day_no % 12053;

   $jy = 979+33*$j_np+4*div($j_day_no,1461); /* 1461 = 365*4 + 4/4 */

   $j_day_no %= 1461;

   if ($j_day_no >= 366) {
      $jy += div($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);
}

function jalali_to_gregorian($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 + div($jy, 33)*8 + div($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;

   $gy = 1600 + 400*div($g_day_no, 146097); /* 146097 = 365*400 + 400/4 - 400/100 + 400/400 */
   $g_day_no = $g_day_no % 146097;

   $leap = true;
   if ($g_day_no >= 36525) /* 36525 = 365*100 + 100/4 */
   {
      $g_day_no--;
      $gy += 100*div($g_day_no,  36524); /* 36524 = 365*100 + 100/4 - 100/100 */
      $g_day_no = $g_day_no % 36524;

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

   $gy += 4*div($g_day_no, 1461); /* 1461 = 365*4 + 4/4 */
   $g_day_no %= 1461;

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

      $g_day_no--;
      $gy += div($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);
}

/*
 * Function to Convert user input time (yyyy-mm-dd hh:mm:ss) in persian to english && Hegira date to Gregorian - by irmtfan (www.jadoogaran.org)
 */
function inputTimeToGregorian($usertime)
{

    list( $jfdate, $ftime) = preg_split ( '/ /', $usertime );
    list( $fhour, $fminut, $fsec ) =  preg_split ( '/:/', $ftime);
    // convert persian numbers to english if exist
    $hour=Convertnumber2english($fhour);
    $minut=Convertnumber2english($fminut);
    $sec=Convertnumber2english($fsec);
    list( $jfyear, $jfmonth, $jfday ) =  preg_split ( '/-/', $jfdate);
    // convert persian numbers to english if exist
    $jyear=Convertnumber2english($jfyear);
    $jmonth=Convertnumber2english($jfmonth);
    $jday=Convertnumber2english($jfday);

    if (_JDF_USE_HEGIRADATE) {
        $maket=jmaketime($hour - _JDF_TZhours,$minut - _JDF_TZminute,$sec,$jmonth,$jday,$jyear);
    } else {
        $maket=mktime($hour,$minut,$sec,$jmonth,$jday,$jyear);
    }
    $usertime=date("Y-m-d H:i:s",$maket);
    return $usertime;
}

?>

and lang_jdf.php file :

<?php
// $Id: lang_jdf.php,v 1 2004/11/20 22:09:15 irmtfan www.jadoogaran.org Exp $
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

/* jdate function */
//set 1 if you want translate number to farsi or if you don't like set 0
// اگه میخواید عددها رو به فارسی نشون بده روی 1 قرار بدید و اگه میخواید انگلیسی نشون بده روی 0 بزارید
define("_JDF_USE_PERSIANNUM","1");
// اگر میخواهید تاریخ هجری عمل کند این گزینه را  روی یک بگذارید
define("_JDF_USE_HEGIRADATE","1");
//

///chosse your timezone
// زمان محلی خود را انتخاب کنید تا بر اساس آن زمان محاسبه شود
define("_JDF_TZhours","0");
define("_JDF_TZminute","0");
//

define('_JDF_AM_LONG','قبل از ظهر');
define('_JDF_PM_LONG','بعد از ظهر');

define('_JDF_AM_SHORT','ق.ظ');
define('_JDF_PM_SHORT','ب.ظ');

define('_JDF_Sat_LONG','شنبه');
define('_JDF_Sun_LONG','یکشنبه');
define('_JDF_Mon_LONG','دوشنبه');
define('_JDF_Tue_LONG','سه شنبه');
define('_JDF_Wed_LONG','چهارشنبه');
define('_JDF_Thu_LONG','پنجشنبه');
define('_JDF_Fri_LONG','جمعه');

define('_JDF_Sat_SHORT','ش');
define('_JDF_Sun_SHORT','ی');
define('_JDF_Mon_SHORT','د');
define('_JDF_Tue_SHORT','س');
define('_JDF_Wed_SHORT','چ');
define('_JDF_Thu_SHORT','پ');
define('_JDF_Fri_SHORT','ج');

//English ordinal suffix, textual, 2 characters; i.e. "th", "nd"
//  وقتی میخواهیم بگویم چندیمن عدد به کار میرود در انگلیسی دو کاراکتر است ولی در فارسی یک کاراکتر »م« برای آن کافی است مثال: چهارم ، پنجم
define('_JDF_Suffix','م');
//

/* monthname function */
define('_JDF_Far','فروردین');
define('_JDF_Ord','اردیبهشت');
define('_JDF_Kho','خرداد');
define('_JDF_Tir','تیر');
define('_JDF_Mor','مرداد');
define('_JDF_Sha','شهریور');
define('_JDF_Meh','مهر');
define('_JDF_Aba','آبان');
define('_JDF_Aza','آذر');
define('_JDF_Dey','دی');
define('_JDF_Bah','بهمن');
define('_JDF_Esf','اسفند');

/* Convertnumber2farsi && Convertnumber2english functions */
define('_JDF_Num0','۰');
define('_JDF_Num1','۱');
define('_JDF_Num2','۲');
define('_JDF_Num3','۳');
define('_JDF_Num4','۴');
define('_JDF_Num5','۵');
define('_JDF_Num6','۶');
define('_JDF_Num7','۷');
define('_JDF_Num8','۸');
define('_JDF_Num9','۹');
?>

now i want to insert this function to drupal system . what i can do it?