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eds_scikit.utils.datetime_helpers

add_timedelta 

add_timedelta(series: Series, **kwargs) -> Series

Adds a unique timedelta to a Pandas or Koalas Series

Source code in eds_scikit/utils/datetime_helpers.py 
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def add_timedelta(series: Series, **kwargs) -> Series:
    """
    Adds a unique timedelta to a Pandas or Koalas Series
    """
    return series.map(lambda d: d + timedelta(**kwargs))

substract_datetime 

substract_datetime(series_1: Series, series_2: Series, out: str = 'seconds') -> Series

Substract 2 datetime series and return the number of seconds or hours between them.

Source code in eds_scikit/utils/datetime_helpers.py 
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def substract_datetime(
    series_1: Series,
    series_2: Series,
    out: str = "seconds",
) -> Series:
    """
    Substract 2 datetime series and return the number of seconds or hours
    between them.
    """

    if out not in ["seconds", "hours"]:
        raise ValueError("the 'out' parameter should be in ['hours','seconds']")
    if not (
        np.issubdtype(series_1.dtype, np.datetime64)
        and np.issubdtype(series_2.dtype, np.datetime64)
    ):
        raise TypeError("One of the provided Serie isn't a datetime Serie")

    if is_pandas(series_1) and is_pandas(series_2):
        diff = (series_1 - series_2).dt.total_seconds()

    elif is_koalas(series_1) and is_koalas(series_2):
        diff = series_1 - series_2

    else:
        raise TypeError("Both series should either be a Koalas or Pandas Serie")

    if out == "hours":
        return diff / 3600
    return diff