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This module offers timezone implementations subclassing the abstract
:py:class:`datetime.tzinfo` type. There are classes to handle tzfile format
files (usually are in :file:`/etc/localtime`, :file:`/usr/share/zoneinfo`,
etc), TZ environment string (in all known formats), given ranges (with help
from relative deltas), local machine timezone, fixed offset timezone, and UTC
timezone.
�N)�OrderedDict)�string_types)�_thread�)�tzname_in_python2�_tzinfo)�tzrangebase�enfold)�_validate_fromutc_inputs)�_TzSingleton�_TzOffsetFactory)�
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    This is a tzinfo object that represents the UTC time zone.

    **Examples:**

    .. doctest::

        >>> from datetime import *
        >>> from dateutil.tz import *

        >>> datetime.now()
        datetime.datetime(2003, 9, 27, 9, 40, 1, 521290)

        >>> datetime.now(tzutc())
        datetime.datetime(2003, 9, 27, 12, 40, 12, 156379, tzinfo=tzutc())

        >>> datetime.now(tzutc()).tzname()
        'UTC'

    .. versionchanged:: 2.7.0
        ``tzutc()`` is now a singleton, so the result of ``tzutc()`` will
        always return the same object.

        .. doctest::

            >>> from dateutil.tz import tzutc, UTC
            >>> tzutc() is tzutc()
            True
            >>> tzutc() is UTC
            True
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        Whether or not the "wall time" of a given datetime is ambiguous in this
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�	��)�)�+�+�F�F���>�*�	�	�	��D�	���� �)�2G��2O�2O�P�P�P����s��2�2c��|jSr�r.rs  rrztzoffset.utcoffset�s
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        Whether or not the "wall time" of a given datetime is ambiguous in this
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    A :class:`tzinfo` subclass built around the ``time`` timezone functions.
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	3rNc��||kSrr#r/s  rr3z_ttinfo.__ne__fr4rc�F�i}|jD]}t||d��||<�|Sr)r�r}�r�staterOs   r�__getstate__z_ttinfo.__getstate__is4�����N�	4�	4�D�!�$��d�3�3�E�$�K�K��rc�P�|jD]}||vrt||||���dSrr�r�s   r�__setstate__z_ttinfo.__setstate__os=���N�	1�	1�D��u�}�}���d�E�$�K�0�0�0��	1�	1r)r9r=r>r�rQr;r1r@r3r�r�r#rrr�r�Hs�������0�0�0�I�&�&�&�B�B�B�
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3��H�#�#�#����1�1�1�1�1rr�c� �eZdZdZgd�Zd�ZdS)�_tzfilezw
    Lightweight class for holding the relevant transition and time zone
    information read from binary tzfiles.
    )�
trans_list�trans_list_utc�	trans_idx�ttinfo_list�
ttinfo_std�
ttinfo_dst�
ttinfo_before�ttinfo_firstc	�d�|jD]'}t|||�|d�����(dSr)�attrsr��get)r�kwargsr�s   rrQz_tzfile.__init__}s@���J�	8�	8�D��D�$��
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�4�� 6� 6�7�7�7�7�	8�	8rN)r9r=r>r?r�rQr#rrr�r�usA��������
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J�E�8�8�8�8�8rr�c���eZdZdZd�fd�	Zd�Zd�Zdd�Zd�Zd	�Z	d
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    This is a ``tzinfo`` subclass that allows one to use the ``tzfile(5)``
    format timezone files to extract current and historical zone information.

    :param fileobj:
        This can be an opened file stream or a file name that the time zone
        information can be read from.

    :param filename:
        This is an optional parameter specifying the source of the time zone
        information in the event that ``fileobj`` is a file object. If omitted
        and ``fileobj`` is a file stream, this parameter will be set either to
        ``fileobj``'s ``name`` attribute or to ``repr(fileobj)``.

    See `Sources for Time Zone and Daylight Saving Time Data
    <https://data.iana.org/time-zones/tz-link.html>`_ for more information.
    Time zone files can be compiled from the `IANA Time Zone database files
    <https://www.iana.org/time-zones>`_ with the `zic time zone compiler
    <https://www.freebsd.org/cgi/man.cgi?query=zic&sektion=8>`_

    .. note::

        Only construct a ``tzfile`` directly if you have a specific timezone
        file on disk that you want to read into a Python ``tzinfo`` object.
        If you want to get a ``tzfile`` representing a specific IANA zone,
        (e.g. ``'America/New_York'``), you should call
        :func:`dateutil.tz.gettz` with the zone identifier.


    **Examples:**

    Using the US Eastern time zone as an example, we can see that a ``tzfile``
    provides time zone information for the standard Daylight Saving offsets:

    .. testsetup:: tzfile

        from dateutil.tz import gettz
        from datetime import datetime

    .. doctest:: tzfile

        >>> NYC = gettz('America/New_York')
        >>> NYC
        tzfile('/usr/share/zoneinfo/America/New_York')

        >>> print(datetime(2016, 1, 3, tzinfo=NYC))     # EST
        2016-01-03 00:00:00-05:00

        >>> print(datetime(2016, 7, 7, tzinfo=NYC))     # EDT
        2016-07-07 00:00:00-04:00


    The ``tzfile`` structure contains a fully history of the time zone,
    so historical dates will also have the right offsets. For example, before
    the adoption of the UTC standards, New York used local solar  mean time:

    .. doctest:: tzfile

       >>> print(datetime(1901, 4, 12, tzinfo=NYC))    # LMT
       1901-04-12 00:00:00-04:56

    And during World War II, New York was on "Eastern War Time", which was a
    state of permanent daylight saving time:

    .. doctest:: tzfile

        >>> print(datetime(1944, 2, 7, tzinfo=NYC))    # EWT
        1944-02-07 00:00:00-04:00

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        The ``tzfile`` implementation of :py:func:`datetime.tzinfo.fromutc`.

        :param dt:
            A :py:class:`datetime.datetime` object.

        :raises TypeError:
            Raised if ``dt`` is not a :py:class:`datetime.datetime` object.

        :raises ValueError:
            Raised if this is called with a ``dt`` which does not have this
            ``tzinfo`` attached.

        :return:
            Returns a :py:class:`datetime.datetime` object representing the
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    start, end and offsets.

    :param stdabbr:
        The abbreviation for standard time (e.g. ``'EST'``).

    :param stdoffset:
        An integer or :class:`datetime.timedelta` object or equivalent
        specifying the base offset from UTC.

        If unspecified, +00:00 is used.

    :param dstabbr:
        The abbreviation for DST / "Summer" time (e.g. ``'EDT'``).

        If specified, with no other DST information, DST is assumed to occur
        and the default behavior or ``dstoffset``, ``start`` and ``end`` is
        used. If unspecified and no other DST information is specified, it
        is assumed that this zone has no DST.

        If this is unspecified and other DST information is *is* specified,
        DST occurs in the zone but the time zone abbreviation is left
        unchanged.

    :param dstoffset:
        A an integer or :class:`datetime.timedelta` object or equivalent
        specifying the UTC offset during DST. If unspecified and any other DST
        information is specified, it is assumed to be the STD offset +1 hour.

    :param start:
        A :class:`relativedelta.relativedelta` object or equivalent specifying
        the time and time of year that daylight savings time starts. To
        specify, for example, that DST starts at 2AM on the 2nd Sunday in
        March, pass:

            ``relativedelta(hours=2, month=3, day=1, weekday=SU(+2))``

        If unspecified and any other DST information is specified, the default
        value is 2 AM on the first Sunday in April.

    :param end:
        A :class:`relativedelta.relativedelta` object or equivalent
        representing the time and time of year that daylight savings time
        ends, with the same specification method as in ``start``. One note is
        that this should point to the first time in the *standard* zone, so if
        a transition occurs at 2AM in the DST zone and the clocks are set back
        1 hour to 1AM, set the ``hours`` parameter to +1.


    **Examples:**

    .. testsetup:: tzrange

        from dateutil.tz import tzrange, tzstr

    .. doctest:: tzrange

        >>> tzstr('EST5EDT') == tzrange("EST", -18000, "EDT")
        True

        >>> from dateutil.relativedelta import *
        >>> range1 = tzrange("EST", -18000, "EDT")
        >>> range2 = tzrange("EST", -18000, "EDT", -14400,
        ...                  relativedelta(hours=+2, month=4, day=1,
        ...                                weekday=SU(+1)),
        ...                  relativedelta(hours=+1, month=10, day=31,
        ...                                weekday=SU(-1)))
        >>> tzstr('EST5EDT') == range1 == range2
        True

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        :param year:
            The year whose transitions you would like to query.

        :return:
            Returns a :class:`tuple` of :class:`datetime.datetime` objects,
            ``(dston, dstoff)`` for zones with an annual DST transition, or
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    inverted offset format, so normally ``GMT+3`` would be parsed as an offset
    3 hours *behind* GMT. The ``tzstr`` time zone object will parse this as an
    offset 3 hours *ahead* of GMT. If you would like to maintain the POSIX
    behavior, pass a ``True`` value to ``posix_offset``.

    The :class:`tzrange` object provides the same functionality, but is
    specified using :class:`relativedelta.relativedelta` objects. rather than
    strings.

    :param s:
        A time zone string in ``TZ`` variable format. This can be a
        :class:`bytes` (2.x: :class:`str`), :class:`str` (2.x:
        :class:`unicode`) or a stream emitting unicode characters
        (e.g. :class:`StringIO`).

    :param posix_offset:
        Optional. If set to ``True``, interpret strings such as ``GMT+3`` or
        ``UTC+3`` as being 3 hours *behind* UTC rather than ahead, per the
        POSIX standard.

    .. caution::

        Prior to version 2.7.0, this function also supported time zones
        in the format:

            * ``EST5EDT,4,0,6,7200,10,0,26,7200,3600``
            * ``EST5EDT,4,1,0,7200,10,-1,0,7200,3600``

        This format is non-standard and has been deprecated; this function
        will raise a :class:`DeprecatedTZFormatWarning` until
        support is removed in a future version.

    .. _`GNU C Library: TZ Variable`:
        https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
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�tzicala[
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        If no argument or an empty string is passed to ``gettz``, local time
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        .. code-block:: python3

            >>> gettz()
            tzfile('/etc/localtime')

        This function is also the preferred way to map IANA tz database keys
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        .. code-block:: python3

            >>> gettz('Pacific/Kiritimati')
            tzfile('/usr/share/zoneinfo/Pacific/Kiritimati')

        On Windows, the standard is extended to include the Windows-specific
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        .. code-block:: python3

            >>> gettz('Egypt Standard Time')
            tzwin('Egypt Standard Time')

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        .. code-block:: python3

            >>> gettz('AEST-10AEDT-11,M10.1.0/2,M4.1.0/3')
            tzstr('AEST-10AEDT-11,M10.1.0/2,M4.1.0/3')

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        :return:
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        .. versionchanged:: 2.7.0

            After version 2.7.0, any two calls to ``gettz`` using the same
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            .. code-block:: python3

                >>> tz.gettz('America/Chicago') is tz.gettz('America/Chicago')
                True

            In addition to improving performance, this ensures that
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        .. _`TZ variable`:
            https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html

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    :param tz:
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    .. doctest::

        >>> from dateutil import tz
        >>> from datetime import datetime
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        2017-03-12 03:30:00-04:00

        >>> KIR = tz.gettz('Pacific/Kiritimati')
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