M-DD",
    ...     datetime_format="YYYY-MM-DD HH:MM:SS"
    ... ) as writer:
    ...     df.to_excel(writer)  # doctest: +SKIP

    You can also append to an existing Excel file:

    >>> with pd.ExcelWriter("path_to_file.xlsx", mode="a", engine="openpyxl") as writer:
    ...     df.to_excel(writer, sheet_name="Sheet3")  # doctest: +SKIP

    Here, the `if_sheet_exists` parameter can be set to replace a sheet if it
    already exists:

    >>> with ExcelWriter(
    ...     "path_to_file.xlsx",
    ...     mode="a",
    ...     engine="openpyxl",
    ...     if_sheet_exists="replace",
    ... ) as writer:
    ...     df.to_excel(writer, sheet_name="Sheet1")  # doctest: +SKIP

    You can also write multiple DataFrames to a single sheet. Note that the
    ``if_sheet_exists`` parameter needs to be set to ``overlay``:

    >>> with ExcelWriter("path_to_file.xlsx",
    ...     mode="a",
    ...     engine="openpyxl",
    ...     if_sheet_exists="overlay",
    ... ) as writer:
    ...     df1.to_excel(writer, sheet_name="Sheet1")
    ...     df2.to_excel(writer, sheet_name="Sheet1", startcol=3)  # doctest: +SKIP

    You can store Excel file in RAM:

    >>> import io
    >>> df = pd.DataFrame([["ABC", "XYZ"]], columns=["Foo", "Bar"])
    >>> buffer = io.BytesIO()
    >>> with pd.ExcelWriter(buffer) as writer:
    ...     df.to_excel(writer)

    You can pack Excel file into zip archive:

    >>> import zipfile  # doctest: +SKIP
    >>> df = pd.DataFrame([["ABC", "XYZ"]], columns=["Foo", "Bar"])  # doctest: +SKIP
    >>> with zipfile.ZipFile("path_to_file.zip", "w") as zf:
    ...     with zf.open("filename.xlsx", "w") as buffer:
    ...         with pd.ExcelWriter(buffer) as writer:
    ...             df.to_excel(writer)  # doctest: +SKIP

    You can specify additional arguments to the underlying engine:

    >>> with pd.ExcelWriter(
    ...     "path_to_file.xlsx",
    ...     engine="xlsxwriter",
    ...     engine_kwargs={{"options": {{"nan_inf_to_errors": True}}}}
    ... ) as writer:
    ...     df.to_excel(writer)  # doctest: +SKIP

    In append mode, ``engine_kwargs`` are passed through to
    openpyxl's ``load_workbook``:

    >>> with pd.ExcelWriter(
    ...     "path_to_file.xlsx",
    ...     engine="openpyxl",
    ...     mode="a",
    ...     engine_kwargs={{"keep_vba": True}}
    ... ) as writer:
    ...     df.to_excel(writer, sheet_name="Sheet2")  # doctest: +SKIP
    rd