add birthday events into jQuery full calendar each year

I'm trying to insert into jQuery full calendar event data, which in this case represents birthdays of users. I'm retrieving birthdays from MySQL database. Let's take a look at script

php:

if ($birthday_r = $connection->query("SELECT CONCAT(name,' ',surname),MONTH(birthday),DAY(birthday) FROM users")){
    while ($birthday_row = $birthday_r->fetch_row()){
        $birthday_array[] = array(
        'title' => $birthday_row[0],
        'start' => Date("Y") . "-" . $birthday_row[1] . "-" . $birthday_row[2]
        );
    }
    $json = json_encode($birthday_array);
    birthday_r->free();
}

Then how you see storing this json encoded information into the $json variable

javascript:

jQuery("#calendar").fullCalendar({ // initialize full calendar
        header: {
            left: 'prev,next today',
            center: 'title',
            right: 'month,basicWeek,basicDay'
        },
        <?php if (isset($json_encode)){echo "events: " . $json . ",";} ?>
        viewDisplay: function(view){
            var i = view.title.slice(-4);
        },
        renderEvent: function(event){

        }
    });

Tthis works nice when page is loaded, but I want that after changing agenda (I mean for example press next, or prev buttons) , for every year birthday be shown in calendar. For this purpose I've advised to use viewDisplay and renderEvent functions , but I can not modifying year variable how in php as well in javascript. in viewDisplay function variable i is numeric value of year (like 2012). My problem is to somehow update Date("Y") with i variable into renderEvent function . Also I've tried to store retrieved information into javascript variable like so =>

in this example considered that in php is given

'start' => $birthday_row[1] . "-" . $birthday_row[2] // php

// below JavaScript code
var json_obj = <?php if (isset($birthday_array)){echo $birthday_array;} ?>

var d = new Date();

for (var i=0;i<json_obj.length;i++){
    json_obj[i] = d.getFullYear() + "-" + json_obj[i];
} // this scripts works as well but I can not manipulate after prev or next buttons are pressed on calendar

PS. I think guys , understand what I'm trying to do, pls help me how to do that . Thanks a lot beforehand :)

Well the easiest solutions may be to alter your PHP loop and add "multiple" years to your events.

while ($birthday_row = $birthday_r->fetch_row()){
    $yearBegin = date("Y");
    $yearEnd = $yearBegin + 10; // edit for your needs
    $years = range($yearBegin, $yearEnd, 1);

    foreach($years as $year){
        $birthday_array[] = array(
            'title' => $birthday_row[0],
            'start' => $year . "-" . $birthday_row[1] . "-" . $birthday_row[2]
        );
    }
}

Two drawbacks :