superjson/pkg/dateutil/tz/_common.py
def _fromutc(self, dt):
        """
        Given a timezone-aware datetime in a given timezone, calculates a
        timezone-aware datetime in a new timezone.

        Since this is the one time that we *know* we have an unambiguous
        datetime object, we take this opportunity to determine whether the
        datetime is ambiguous and in a "fold" state (e.g. if it's the first
        occurence, chronologically, of the ambiguous datetime).

        :param dt:
            A timezone-aware :class:`datetime.datetime` object.
        """

        # Re-implement the algorithm from Python's datetime.py
        dtoff = dt.utcoffset()
        if dtoff is None:
            raise ValueError("fromutc() requires a non-None utcoffset() "
                             "result")

        # The original datetime.py code assumes that `dst()` defaults to
        # zero during ambiguous times. PEP 495 inverts this presumption, so
        # for pre-PEP 495 versions of python, we need to tweak the algorithm.
        dtdst = dt.dst()
        if dtdst is None:
            raise ValueError("fromutc() requires a non-None dst() result")
        delta = dtoff - dtdst

        dt += delta
        # Set fold=1 so we can default to being in the fold for
        # ambiguous dates.
        dtdst = enfold(dt, fold=1).dst()
        if dtdst is None:
            raise ValueError("fromutc(): dt.dst gave inconsistent "
                             "results; cannot convert")
        return dt + dtdst
def _fromutc(self, dt):
        """
        Given a timezone-aware datetime in a given timezone, calculates a
        timezone-aware datetime in a new timezone.

        Since this is the one time that we *know* we have an unambiguous
        datetime object, we take this opportunity to determine whether the
        datetime is ambiguous and in a "fold" state (e.g. if it's the first
        occurence, chronologically, of the ambiguous datetime).

        :param dt:
            A timezone-aware :class:`datetime.datetime` object.
        """

        # Re-implement the algorithm from Python's datetime.py
        dtoff = dt.utcoffset()
        if dtoff is None:
            raise ValueError("fromutc() requires a non-None utcoffset() "
                             "result")

        # The original datetime.py code assumes that `dst()` defaults to
        # zero during ambiguous times. PEP 495 inverts this presumption, so
        # for pre-PEP 495 versions of python, we need to tweak the algorithm.
        dtdst = dt.dst()
        if dtdst is None:
            raise ValueError("fromutc() requires a non-None dst() result")
        delta = dtoff - dtdst

        dt += delta
        # Set fold=1 so we can default to being in the fold for
        # ambiguous dates.
        dtdst = enfold(dt, fold=1).dst()
        if dtdst is None:
            raise ValueError("fromutc(): dt.dst gave inconsistent "
                             "results; cannot convert")
        return dt + dtdst
def _fromutc ( self , dt ) : # Re-implement the algorithm from Python's datetime.py dtoff = dt . utcoffset ( ) if dtoff is None : raise ValueError ( "fromutc() requires a non-None utcoffset() " "result" ) # The original datetime.py code assumes that `dst()` defaults to # zero during ambiguous times. PEP 495 inverts this presumption, so # for pre-PEP 495 versions of python, we need to tweak the algorithm. dtdst = dt . dst ( ) if dtdst is None : raise ValueError ( "fromutc() requires a non-None dst() result" ) delta = dtoff - dtdst dt += delta # Set fold=1 so we can default to being in the fold for # ambiguous dates. dtdst = enfold ( dt , fold = 1 ) . dst ( ) if dtdst is None : raise ValueError ( "fromutc(): dt.dst gave inconsistent " "results; cannot convert" ) return dt + dtdst
Given a timezone-aware datetime in a given timezone, calculates a
        timezone-aware datetime in a new timezone.

        Since this is the one time that we *know* we have an unambiguous
        datetime object, we take this opportunity to determine whether the
        datetime is ambiguous and in a "fold" state (e.g. if it's the first
        occurence, chronologically, of the ambiguous datetime).

        :param dt:
            A timezone-aware :class:`datetime.datetime` object.
Given a timezone - aware datetime in a given timezone calculates a timezone - aware datetime in a new timezone .