Exemple #1
0
def to_datetime(arg, errors='ignore', dayfirst=False, box=True):
    """
    Convert argument to datetime

    Parameters
    ----------
    arg : string, datetime, array of strings (with possible NAs)
    errors : {'ignore', 'raise'}, default 'ignore'
        Errors are ignored by default (values left untouched)

    Returns
    -------
    ret : datetime if parsing succeeded
    """
    from pandas.core.series import Series
    from pandas.tseries.index import DatetimeIndex
    if arg is None:
        return arg
    elif isinstance(arg, datetime):
        return arg
    elif isinstance(arg, Series):
        values = lib.array_to_datetime(com._ensure_object(arg.values),
                                       raise_=errors == 'raise',
                                       dayfirst=dayfirst)
        return Series(values, index=arg.index, name=arg.name)
    elif isinstance(arg, (np.ndarray, list)):
        if isinstance(arg, list):
            arg = np.array(arg, dtype='O')
        result = lib.array_to_datetime(com._ensure_object(arg),
                                       raise_=errors == 'raise',
                                       dayfirst=dayfirst)
        if com.is_datetime64_dtype(result) and box:
            result = DatetimeIndex(result)
        return result
    try:
        if not arg:
            return arg
        return _dtparser.parse(arg, dayfirst=dayfirst)
    except Exception:
        if errors == 'raise':
            raise
        return arg
Exemple #2
0
    def _convert_f(arg):
        arg = com._ensure_object(arg)

        try:
            result = lib.array_to_datetime(arg, raise_=errors == 'raise',
                                           utc=utc, dayfirst=dayfirst)
            if com.is_datetime64_dtype(result) and box:
                result = DatetimeIndex(result, tz='utc' if utc else None)
            return result
        except ValueError, e:
            try:
                values, tz = lib.datetime_to_datetime64(arg)
                return DatetimeIndex._simple_new(values, None, tz=tz)
            except (ValueError, TypeError):
                raise e