Convert Jalali calendar to Georgian by PHP in CodeIgniter

Question

I need to store Date in Persian (Jalali) date in MySQL. I'm using CodeIgniter. I need something like this:

$Date = Jalali_to_Georgian(1393,5,28) // Output: "2014/08/19"

Do I need to create a new library for this?

Answer 1

It's generally better to stick to existing libs rather than writing your own one. Try, for example, jDateTime or Gregorian-Jalali-Date-Convertor.

P.S. I never tried to use them myself, but first one looks much more solid.

Answer 2

First, Create a library in application/libraries named Calendar.php

Class Calendar
{


    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 + $this->div($jy, 33)*8 + $this->div($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;

        $gy = 1600 + 400*$this->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--;
            $gy += 100*$this->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;
        }

        $gy += 4*$this->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 += $this->div($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);
    }
}

Then use it whenever you want:

Class TestController
{
    function index()
    {
        $this->load->library('calendar');
        list($year, $month, $day) = $this->calendar->jalali_to_gregorian(1395,5,12);
        echo "$year/$month/$day";
    }
}

Best Regards

Answer 3

You can use this function

jalali_to_gregorian($year, $month, $day, $separator);

• Example with separator:

  jalali_to_gregorian(1398, 5, 7, "-"); // Output => 2019-7-29
  

• Example without separator:

  jalali_to_gregorian(1398, 5, 7); // Output => ["2019","7","29"]
  

And this is the function:

function jalali_to_gregorian($jy, $jm, $jd, $mod = '')
{
    if ($jy > 979) {
        $gy = 1600;
        $jy -= 979;
    } else {
        $gy = 621;
    }

    $days = (365 * $jy) + (((int)($jy / 33)) * 8) + ((int)((($jy % 33) + 3) / 4)) + 78 + $jd + (($jm < 7) ? ($jm - 1) * 31 : (($jm - 7) * 30) + 186);
    $gy += 400 * ((int)($days / 146097));
    $days %= 146097;
    if ($days > 36524) {
        $gy += 100 * ((int)(--$days / 36524));
        $days %= 36524;
        if ($days >= 365) $days++;
    }
    $gy += 4 * ((int)(($days) / 1461));
    $days %= 1461;
    $gy += (int)(($days - 1) / 365);
    if ($days > 365) $days = ($days - 1) % 365;
    $gd = $days + 1;
    foreach (array(0, 31, ((($gy % 4 == 0) and ($gy % 100 != 0)) or ($gy % 400 == 0)) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31) as $gm => $v) {
        if ($gd <= $v) break;
        $gd -= $v;
    }

    return ($mod === '') ? array($gy, $gm, $gd) : $gy . $mod . $gm . $mod . $gd;
}