Python datetime.tzinfo方法代码示例

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def __add__(self, other):
        if PY38:
            result = datetime(
                self.year,
                self.month,
                self.day,
                self.hour,
                self.minute,
                self.second,
                self.microsecond,
                self.tzinfo,
            ).__add__(other)
        else:
            result = super(DateTime, self).__add__(other)

        return self._new(result) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def __sub__(self, other):
        if PY38:
            result = datetime(
                self.year,
                self.month,
                self.day,
                self.hour,
                self.minute,
                self.second,
                self.microsecond,
                self.tzinfo,
            ).__sub__(other)
        else:
            result = super(DateTime, self).__sub__(other)

        if isinstance(result, datetime):
            result = self._new(result)

        return result 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def is_ambiguous(self, dt):
        """
        Whether or not the "wall time" of a given datetime is ambiguous in this
        zone.

        :param dt:
            A :py:class:`datetime.datetime`, naive or time zone aware.


        :return:
            Returns ``True`` if ambiguous, ``False`` otherwise.

        .. versionadded:: 2.6.0
        """

        dt = dt.replace(tzinfo=self)

        wall_0 = enfold(dt, fold=0)
        wall_1 = enfold(dt, fold=1)

        same_offset = wall_0.utcoffset() == wall_1.utcoffset()
        same_dt = wall_0.replace(tzinfo=None) == wall_1.replace(tzinfo=None)

        return same_dt and not same_offset 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def _fold_status(self, dt_utc, dt_wall):
        """
        Determine the fold status of a "wall" datetime, given a representation
        of the same datetime as a (naive) UTC datetime. This is calculated based
        on the assumption that ``dt.utcoffset() - dt.dst()`` is constant for all
        datetimes, and that this offset is the actual number of hours separating
        ``dt_utc`` and ``dt_wall``.

        :param dt_utc:
            Representation of the datetime as UTC

        :param dt_wall:
            Representation of the datetime as "wall time". This parameter must
            either have a `fold` attribute or have a fold-naive
            :class:`datetime.tzinfo` attached, otherwise the calculation may
            fail.
        """
        if self.is_ambiguous(dt_wall):
            delta_wall = dt_wall - dt_utc
            _fold = int(delta_wall == (dt_utc.utcoffset() - dt_utc.dst()))
        else:
            _fold = 0

        return _fold 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def _isdst(self, dt):
        if not self.hasdst:
            return False
        elif dt is None:
            return None

        transitions = self.transitions(dt.year)

        if transitions is None:
            return False

        dt = dt.replace(tzinfo=None)

        isdst = self._naive_isdst(dt, transitions)

        # Handle ambiguous dates
        if not isdst and self.is_ambiguous(dt):
            return not self._fold(dt)
        else:
            return isdst 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def tz_to_dtype(tz):
    """
    Return a datetime64[ns] dtype appropriate for the given timezone.

    Parameters
    ----------
    tz : tzinfo or None

    Returns
    -------
    np.dtype or Datetime64TZDType
    """
    if tz is None:
        return _NS_DTYPE
    else:
        return DatetimeTZDtype(tz=tz) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def _assert_tzawareness_compat(self, other):
        # adapted from _Timestamp._assert_tzawareness_compat
        other_tz = getattr(other, 'tzinfo', None)
        if is_datetime64tz_dtype(other):
            # Get tzinfo from Series dtype
            other_tz = other.dtype.tz
        if other is NaT:
            # pd.NaT quacks both aware and naive
            pass
        elif self.tz is None:
            if other_tz is not None:
                raise TypeError('Cannot compare tz-naive and tz-aware '
                                'datetime-like objects.')
        elif other_tz is None:
            raise TypeError('Cannot compare tz-naive and tz-aware '
                            'datetime-like objects')

    # -----------------------------------------------------------------
    # Arithmetic Methods 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def is_ambiguous(self, dt):
        """
        Whether or not the "wall time" of a given datetime is ambiguous in this
        zone.

        :param dt:
            A :py:class:`datetime.datetime`, naive or time zone aware.


        :return:
            Returns ``True`` if ambiguous, ``False`` otherwise.

        ..versionadded:: 2.6.0
        """

        dt = dt.replace(tzinfo=self)

        wall_0 = enfold(dt, fold=0)
        wall_1 = enfold(dt, fold=1)

        same_offset = wall_0.utcoffset() == wall_1.utcoffset()
        same_dt = wall_0.replace(tzinfo=None) == wall_1.replace(tzinfo=None)
        
        return same_dt and not same_offset 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def __new__(
        cls,
        year,
        month,
        day,
        hour,
        minute,
        second,
        microsecond,
        tzinfo,
        trivia,
        raw,
        **kwargs
    ):  # type: (int, int, int, int, int, int, int, Optional[datetime.tzinfo], Trivia, str, Any) -> datetime
        return datetime.__new__(
            cls,
            year,
            month,
            day,
            hour,
            minute,
            second,
            microsecond,
            tzinfo=tzinfo,
            **kwargs
        ) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def __init__(
        self, year, month, day, hour, minute, second, microsecond, tzinfo, trivia, raw
    ):  # type: (int, int, int, int, int, int, int, Optional[datetime.tzinfo], Trivia, str) -> None
        super(DateTime, self).__init__(trivia)

        self._raw = raw 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def _new(self, result):
        raw = result.isoformat()

        return DateTime(
            result.year,
            result.month,
            result.day,
            result.hour,
            result.minute,
            result.second,
            result.microsecond,
            result.tzinfo,
            self._trivia,
            raw,
        ) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def _getstate(self, protocol=3):
        return (
            self.hour,
            self.minute,
            self.second,
            self.microsecond,
            self.tzinfo,
            self._trivia,
            self._raw,
        ) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def replace(self, *args, **kwargs):
            """
            Return a datetime with the same attributes, except for those
            attributes given new values by whichever keyword arguments are
            specified. Note that tzinfo=None can be specified to create a naive
            datetime from an aware datetime with no conversion of date and time
            data.

            This is reimplemented in ``_DatetimeWithFold`` because pypy3 will
            return a ``datetime.datetime`` even if ``fold`` is unchanged.
            """
            argnames = (
                'year', 'month', 'day', 'hour', 'minute', 'second',
                'microsecond', 'tzinfo'
            )

            for arg, argname in zip(args, argnames):
                if argname in kwargs:
                    raise TypeError('Duplicate argument: {}'.format(argname))

                kwargs[argname] = arg

            for argname in argnames:
                if argname not in kwargs:
                    kwargs[argname] = getattr(self, argname)

            dt_class = self.__class__ if kwargs.get('fold', 1) else datetime

            return dt_class(**kwargs) 

# 需要导入模块: from datetime import datetime [as 别名]
# 或者: from datetime.datetime import tzinfo [as 别名]
def enfold(dt, fold=1):
        """
        Provides a unified interface for assigning the ``fold`` attribute to
        datetimes both before and after the implementation of PEP-495.

        :param fold:
            The value for the ``fold`` attribute in the returned datetime. This
            should be either 0 or 1.

        :return:
            Returns an object for which ``getattr(dt, 'fold', 0)`` returns
            ``fold`` for all versions of Python. In versions prior to
            Python 3.6, this is a ``_DatetimeWithFold`` object, which is a
            subclass of :py:class:`datetime.datetime` with the ``fold``
            attribute added, if ``fold`` is 1.

        .. versionadded:: 2.6.0
        """
        if getattr(dt, 'fold', 0) == fold:
            return dt

        args = dt.timetuple()[:6]
        args += (dt.microsecond, dt.tzinfo)

        if fold:
            return _DatetimeWithFold(*args)
        else:
            return datetime(*args)