def _convert_bin_to_numeric_type(bins, dtype):
    """
    if the passed bin is of datetime/timedelta type,
    this method converts it to integer

    Parameters
    ----------
    bins : list-like of bins
    dtype : dtype of data

    Raises
    ------
    ValueError if bins are not of a compat dtype to dtype
    """
    bins_dtype = infer_dtype(bins, skipna=False)
    if is_timedelta64_dtype(dtype):
        if bins_dtype in ['timedelta', 'timedelta64']:
            bins = to_timedelta(bins).view(np.int64)
        else:
            raise ValueError("bins must be of timedelta64 dtype")
    elif is_datetime64_dtype(dtype) or is_datetime64tz_dtype(dtype):
        if bins_dtype in ['datetime', 'datetime64']:
            bins = to_datetime(bins).view(np.int64)
        else:
            raise ValueError("bins must be of datetime64 dtype")

    return bins