def fmt_time(self):
    m = (self.time_minutes % 60)
    h = (self.time_minutes // 60)
    return ('%02d%02dZ' % (h, m))
def fmt_time(self):
    m = (self.time_minutes % 60)
    h = (self.time_minutes // 60)
    return ('%02d%02dZ' % (h, m))