Class ZoneTransition

Lib/test/test_zoneinfo/test_zoneinfo.py:2128–2165

@dataclasses.dataclass(frozen=True)
class ZoneTransition:
    transition: datetime
    offset_before: ZoneOffset
    offset_after: ZoneOffset

    @property
    def transition_utc(self):
        return (self.transition - self.offset_before.utcoffset).replace(
            tzinfo=timezone.utc
        )

    @property
    def fold(self):
        """Whether this introduces a fold"""
        return self.offset_before.utcoffset > self.offset_after.utcoffset

    @property
    def gap(self):
        """Whether this introduces a gap"""
        return self.offset_before.utcoffset < self.offset_after.utcoffset

    @property
    def delta(self):
        return self.offset_after.utcoffset - self.offset_before.utcoffset

    @property
    def anomaly_start(self):
        if self.fold:
            return self.transition + self.delta
        else:
            return self.transition

    @property
    def anomaly_end(self):
        if not self.fold:
            return self.transition + self.delta
        else:
            return self.transition


class ZoneInfoData: