Convert minutes (also negative) like 200 or -300, in the +/-mm:ss notation (+05:00 or -06:00). Useful when working with timezone.

minutesToHoursMinutes.php

function convertToHoursMins($time) {
    $sign = '+';
    if ($time < 0)
      $sign = '-';
    $time = abs($time);  
    $hours = floor($time / 60);
    $minutes = ($time % 60);
    return $sign . sprintf('%02d:%02d', $hours, $minutes);
}

echo convertToHoursMins(-100);