def hhmmss(ms):
    # s = 1000
    # m = 60000
    # h = 360000
    s = round(ms / 1000)
    m, s = divmod(s, 60)
    h, m = divmod(m, 60)
    return ("%d:%02d:%02d" % (h, m, s)) if h else ("%d:%02d" % (m, s))