src/Miladr/Jalali/jDateTime.php
public static function toGregorianStr($j_date, $sep = '/')
	{
		$arr = explode($sep,$j_date);
		if (count($arr) < 3 || intval($arr[0]) == 0) // invalid date
			return "";
		else
		   $g_date = jDateTime::toGregorian($arr[2],$arr[1],$arr[0]);
		return implode($sep,$g_date);
	}
public static function toGregorianStr($j_date, $sep = '/')
	{
		$arr = explode($sep,$j_date);
		if (count($arr) < 3 || intval($arr[0]) == 0) // invalid date
			return "";
		else
		   $g_date = jDateTime::toGregorian($arr[2],$arr[1],$arr[0]);
		return implode($sep,$g_date);
	}
Converts Jalai DateTime to Gregorian and return it as string.
By Ahmad Pouramini