def cdate_range(start=None, end=None, periods=None, freq='C', tz=None,
                normalize=True, name=None, closed=None, **kwargs):

    if freq == 'C':
        holidays = kwargs.pop('holidays', [])
        weekmask = kwargs.pop('weekmask', 'Mon Tue Wed Thu Fri')
        freq = CDay(holidays=holidays, weekmask=weekmask)
    return DatetimeIndex(start=start, end=end, periods=periods, freq=freq,
                         tz=tz, normalize=normalize, name=name,
                         closed=closed, **kwargs)
**EXPERIMENTAL** Return a fixed frequency datetime index, with
dataset/ETHPy150Open pydata/pandas/pandas/tseries/index.py/cdate_range