def format_time_delta(time_delta):
    """Create string after formatting time deltas."""
    timel = []
    for i in time_delta:
        hours, res = divmod(i, 3600)
        minutes, seconds = divmod(res, 60)
        timel.append('{:02d}:{:02d}:{:02d}'.format(int(hours), int(minutes),
            int(seconds)))
    return timel
