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This module offers a parser for ISO-8601 strings

It is intended to support all valid date, time and datetime formats per the
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        :param sep:
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        Parse an ISO-8601 datetime string into a :class:`datetime.datetime`.

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        standard. Incomplete date formats (such as ``YYYY-MM``) may *not* be
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        Supported date formats are:

        Common:

        - ``YYYY``
        - ``YYYY-MM`` or ``YYYYMM``
        - ``YYYY-MM-DD`` or ``YYYYMMDD``

        Uncommon:

        - ``YYYY-Www`` or ``YYYYWww`` - ISO week (day defaults to 0)
        - ``YYYY-Www-D`` or ``YYYYWwwD`` - ISO week and day

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        Supported time zone offset formats are:

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        :param dt_str:
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        .. warning::

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            currently fail (e.g. ``2017-01-01T00:00+00:00:00``) are not
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