def fromutc(self, dt): # type: (_D) -> _D
stamp = timestamp(dt)
transition = self._lookup_transition(stamp, is_utc=True)
if stamp < transition.at and transition.previous is not None:
transition = transition.previous
stamp += transition.ttype.offset
return dt.__class__(*local_time(stamp, 0, dt.microsecond), tzinfo=self)
def _normalize(
self,
dt,
dst_rule=None # type: datetime # type: Union[str, None]
): # type: (...) -> datetime
sec = timestamp(dt)
fold = 0
transition = self._lookup_transition(sec)
if not _HAS_FOLD and dst_rule is None:
dst_rule = POST_TRANSITION
if dst_rule is None:
dst_rule = PRE_TRANSITION
if dt.fold == 1:
dst_rule = POST_TRANSITION
if sec < transition.local:
if transition.is_ambiguous(sec):
# Ambiguous time
if dst_rule == TRANSITION_ERROR:
raise AmbiguousTime(dt)
# We set the fold attribute for later
if dst_rule == POST_TRANSITION:
fold = 1
else:
transition = transition.previous
if transition.is_ambiguous(sec):
# Ambiguous time
if dst_rule == TRANSITION_ERROR:
raise AmbiguousTime(dt)
# We set the fold attribute for later
if dst_rule == POST_TRANSITION:
fold = 1
elif transition.is_missing(sec):
# Skipped time
if dst_rule == TRANSITION_ERROR:
raise NonExistingTime(dt)
# We adjust accordingly
if dst_rule == POST_TRANSITION:
sec += transition.fix
fold = 1
else:
sec -= transition.fix
kwargs = {"tzinfo": self}
if _HAS_FOLD or isinstance(dt, pendulum.DateTime):
kwargs["fold"] = fold
return dt.__class__(*local_time(sec, 0, dt.microsecond), **kwargs)
def _get_transition(self, dt): # type: (_datetime) -> Transition
if dt.tzinfo is not None and dt.tzinfo is not self:
dt = dt - dt.utcoffset()
stamp = timestamp(dt)
transition = self._lookup_transition(stamp, is_utc=True)
else:
stamp = timestamp(dt)
transition = self._lookup_transition(stamp)
if stamp < transition.local and transition.previous is not None:
fold = getattr(dt, "fold", 1)
if transition.is_ambiguous(stamp):
if fold == 0:
transition = transition.previous
elif transition.previous.is_ambiguous(stamp) and fold == 0:
pass
else:
transition = transition.previous
return transition
def _convert(self, dt): # type: (datetime) -> datetime
if dt.tzinfo is self:
return self._normalize(dt, dst_rule=POST_TRANSITION)
if not isinstance(dt.tzinfo, Timezone):
return dt.astimezone(self)
stamp = timestamp(dt)
if isinstance(dt.tzinfo, FixedTimezone):
offset = dt.tzinfo.offset
else:
transition = dt.tzinfo._lookup_transition(stamp)
offset = transition.ttype.offset
if stamp < transition.local:
if (transition.previous.is_ambiguous(stamp)
and getattr(dt, 'fold', 1) == 0):
pass
else:
offset = transition.previous.ttype.offset
stamp -= offset
transition = self._lookup_transition(stamp, is_utc=True)
if stamp < transition.at:
transition = transition.previous
offset = transition.ttype.offset
stamp += offset
fold = int(not transition.ttype.is_dst())
kwargs = {
'tzinfo': self,
}
if _HAS_FOLD or isinstance(dt, pendulum.DateTime):
kwargs['fold'] = fold
return dt.__class__(*local_time(stamp, 0, dt.microsecond), **kwargs)
def _extends(self):
if not self._posix_rule:
return
posix = self._posix_rule
if not posix.dst_abbr:
# std only
# The future specification should match the last/default transition
ttype = self._transitions[-1].ttype
if not self._check_ttype(ttype, posix.std_offset, False,
posix.std_abbr):
raise ValueError("Posix spec does not match last transition")
return
if len(self._transitions) < 2:
raise ValueError("Too few transitions for POSIX spec")
# Extend the transitions for an additional 400 years
# using the future specification
# The future specification should match the last two transitions,
# and those transitions should have different is_dst flags.
tr0 = self._transitions[-1]
tr1 = self._transitions[-2]
tt0 = tr0.ttype
tt1 = tr1.ttype
if tt0.is_dst():
dst = tt0
std = tt1
else:
dst = tt1
std = tt0
self._check_ttype(dst, posix.dst_offset, True, posix.dst_abbr)
self._check_ttype(std, posix.std_offset, False, posix.std_abbr)
# Add the transitions to tr1 and back to tr0 for each extra year.
last_year = local_time(tr0.local, 0, 0)[0]
leap_year = is_leap(last_year)
jan1 = datetime(last_year, 1, 1)
jan1_time = timestamp(jan1)
jan1_weekday = week_day(jan1.year, jan1.month, jan1.day) % 7
if local_time(tr1.local, 0, 0)[0] != last_year:
# Add a single extra transition to align to a calendar year.
if tt0.is_dst():
pt1 = posix.dst_end
else:
pt1 = posix.dst_start
tr1_offset = pt1.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr1_offset - tt0.offset, tr1.ttype,
tr0)
tr0 = tr
tr1 = tr0
tt0 = tr0.ttype
tt1 = tr1.ttype
if tt0.is_dst():
pt1 = posix.dst_end
pt0 = posix.dst_start
else:
pt1 = posix.dst_start
pt0 = posix.dst_end
tr = tr0
for year in range(last_year + 1, last_year + 401):
jan1_time += SECS_PER_YEAR[leap_year]
jan1_weekday = (jan1_weekday + DAYS_PER_YEAR[leap_year]) % 7
leap_year = not leap_year and is_leap(year)
tr1_offset = pt1.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr1_offset - tt0.offset, tt1, tr)
self._transitions.append(tr)
tr0_offset = pt0.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr0_offset - tt1.offset, tt0, tr)
self._transitions.append(tr)
def _extends(self):
if not self._posix_rule:
return
posix = self._posix_rule
if not posix.dst_abbr:
# std only
# The future specification should match the last/default transition
ttype = self._transitions[-1].ttype
if not self._check_ttype(ttype, posix.std_offset, False, posix.std_abbr):
raise ValueError("Posix spec does not match last transition")
return
if len(self._transitions) < 2:
raise ValueError("Too few transitions for POSIX spec")
# Extend the transitions for an additional 400 years
# using the future specification
# The future specification should match the last two transitions,
# and those transitions should have different is_dst flags.
tr0 = self._transitions[-1]
tr1 = self._transitions[-2]
tt0 = tr0.ttype
tt1 = tr1.ttype
if tt0.is_dst():
dst = tt0
std = tt1
else:
dst = tt1
std = tt0
self._check_ttype(dst, posix.dst_offset, True, posix.dst_abbr)
self._check_ttype(std, posix.std_offset, False, posix.std_abbr)
# Add the transitions to tr1 and back to tr0 for each extra year.
last_year = local_time(tr0.local, 0, 0)[0]
leap_year = is_leap(last_year)
jan1 = datetime(last_year, 1, 1)
jan1_time = timestamp(jan1)
jan1_weekday = week_day(jan1.year, jan1.month, jan1.day) % 7
if local_time(tr1.local, 0, 0)[0] != last_year:
# Add a single extra transition to align to a calendar year.
if tt0.is_dst():
pt1 = posix.dst_end
else:
pt1 = posix.dst_start
tr1_offset = pt1.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr1_offset - tt0.offset, tr1.ttype, tr0)
tr0 = tr
tr1 = tr0
tt0 = tr0.ttype
tt1 = tr1.ttype
if tt0.is_dst():
pt1 = posix.dst_end
pt0 = posix.dst_start
else:
pt1 = posix.dst_start
pt0 = posix.dst_end
tr = tr0
for year in range(last_year + 1, last_year + 401):
jan1_time += SECS_PER_YEAR[leap_year]
jan1_weekday = (jan1_weekday + DAYS_PER_YEAR[leap_year]) % 7
leap_year = not leap_year and is_leap(year)
tr1_offset = pt1.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr1_offset - tt0.offset, tt1, tr)
self._transitions.append(tr)
tr0_offset = pt0.trans_offset(leap_year, jan1_weekday)
tr = Transition(jan1_time + tr0_offset - tt1.offset, tt0, tr)
self._transitions.append(tr)
