based on the dtype, return our labels

def _format_labels(bins, precision, right=True,
                   include_lowest=False, dtype=None):
    """ based on the dtype, return our labels """

    closed = 'right' if right else 'left'

    if is_datetime64tz_dtype(dtype):
        formatter = partial(Timestamp, tz=dtype.tz)
        adjust = lambda x: x - Timedelta('1ns')
    elif is_datetime64_dtype(dtype):
        formatter = Timestamp
        adjust = lambda x: x - Timedelta('1ns')
    elif is_timedelta64_dtype(dtype):
        formatter = Timedelta
        adjust = lambda x: x - Timedelta('1ns')
    else:
        precision = _infer_precision(precision, bins)
        formatter = lambda x: _round_frac(x, precision)
        adjust = lambda x: x - 10 ** (-precision)

    breaks = [formatter(b) for b in bins]
    labels = IntervalIndex.from_breaks(breaks, closed=closed)

    if right and include_lowest:
        # we will adjust the left hand side by precision to
        # account that we are all right closed
        v = adjust(labels[0].left)

        i = IntervalIndex([Interval(v, labels[0].right, closed='right')])
        labels = i.append(labels[1:])

    return labels