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from datetime import datetime
from datetime import timedelta
from datetime import tzinfo
from typing import Optional
from typing import TypeVar
from typing import overload
import pendulum
from pendulum.helpers import local_time
from pendulum.helpers import timestamp
from pendulum.utils._compat import _HAS_FOLD
from .exceptions import AmbiguousTime
from .exceptions import NonExistingTime
from .zoneinfo import read
from .zoneinfo import read_file
from .zoneinfo.transition import Transition
POST_TRANSITION = "post"
PRE_TRANSITION = "pre"
TRANSITION_ERROR = "error"
_datetime = datetime
_D = TypeVar("_D", bound=datetime)
class Timezone(tzinfo):
"""
Represents a named timezone.
The accepted names are those provided by the IANA time zone database.
>>> from pendulum.tz.timezone import Timezone
>>> tz = Timezone('Europe/Paris')
"""
def __init__(self, name, extended=True): # type: (str, bool) -> None
tz = read(name, extend=extended)
self._name = name
self._transitions = tz.transitions
self._hint = {True: None, False: None}
@property
def name(self): # type: () -> str
return self._name
def convert(self, dt, dst_rule=None): # type: (_D, Optional[str]) -> _D
"""
Converts a datetime in the current timezone.
If the datetime is naive, it will be normalized.
>>> from datetime import datetime
>>> from pendulum import timezone
>>> paris = timezone('Europe/Paris')
>>> dt = datetime(2013, 3, 31, 2, 30, fold=1)
>>> in_paris = paris.convert(dt)
>>> in_paris.isoformat()
'2013-03-31T03:30:00+02:00'
If the datetime is aware, it will be properly converted.
>>> new_york = timezone('America/New_York')
>>> in_new_york = new_york.convert(in_paris)
>>> in_new_york.isoformat()
'2013-03-30T21:30:00-04:00'
"""
if dt.tzinfo is None:
return self._normalize(dt, dst_rule=dst_rule)
return self._convert(dt)
def datetime(
self, year, month, day, hour=0, minute=0, second=0, microsecond=0
): # type: (int, int, int, int, int, int, int) -> _datetime
"""
Return a normalized datetime for the current timezone.
"""
if _HAS_FOLD:
return self.convert(
datetime(year, month, day, hour, minute, second, microsecond, fold=1)
)
return self.convert(
datetime(year, month, day, hour, minute, second, microsecond),
dst_rule=POST_TRANSITION,
)
def _normalize(self, dt, dst_rule=None): # type: (_D, Optional[str]) -> _D
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
elif transition.previous is not None:
transition = transition.previous
if transition:
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 _convert(self, dt): # type: (_D) -> _D
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 and transition.previous is not None:
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 and transition.previous is not None:
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 _lookup_transition(
self, stamp, is_utc=False
): # type: (int, bool) -> Transition
lo, hi = 0, len(self._transitions)
hint = self._hint[is_utc]
if hint:
if stamp == hint[0]:
return self._transitions[hint[1]]
elif stamp < hint[0]:
hi = hint[1]
else:
lo = hint[1]
if not is_utc:
while lo < hi:
mid = (lo + hi) // 2
if stamp < self._transitions[mid].to:
hi = mid
else:
lo = mid + 1
else:
while lo < hi:
mid = (lo + hi) // 2
if stamp < self._transitions[mid].at:
hi = mid
else:
lo = mid + 1
if lo >= len(self._transitions):
# Beyond last transition
lo = len(self._transitions) - 1
self._hint[is_utc] = (stamp, lo)
return self._transitions[lo]
@overload
def utcoffset(self, dt): # type: (None) -> None
pass
@overload
def utcoffset(self, dt): # type: (_datetime) -> timedelta
pass
def utcoffset(self, dt):
if dt is None:
return
transition = self._get_transition(dt)
return transition.utcoffset()
def dst(
self, dt # type: Optional[_datetime]
): # type: (...) -> Optional[timedelta]
if dt is None:
return
transition = self._get_transition(dt)
if not transition.ttype.is_dst():
return timedelta()
return timedelta(seconds=transition.fix)
def tzname(self, dt): # type: (Optional[_datetime]) -> Optional[str]
if dt is None:
return
transition = self._get_transition(dt)
return transition.ttype.abbreviation
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 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 __repr__(self): # type: () -> str
return "Timezone('{}')".format(self._name)
def __getinitargs__(self): # type: () -> tuple
return (self._name,)
class FixedTimezone(Timezone):
def __init__(self, offset, name=None):
sign = "-" if offset < 0 else "+"
minutes = offset / 60
hour, minute = divmod(abs(int(minutes)), 60)
if not name:
name = "{0}{1:02d}:{2:02d}".format(sign, hour, minute)
self._name = name
self._offset = offset
self._utcoffset = timedelta(seconds=offset)
@property
def offset(self): # type: () -> int
return self._offset
def _normalize(self, dt, dst_rule=None): # type: (_D, Optional[str]) -> _D
if _HAS_FOLD:
dt = dt.__class__(
dt.year,
dt.month,
dt.day,
dt.hour,
dt.minute,
dt.second,
dt.microsecond,
tzinfo=self,
fold=0,
)
else:
dt = dt.__class__(
dt.year,
dt.month,
dt.day,
dt.hour,
dt.minute,
dt.second,
dt.microsecond,
tzinfo=self,
)
return dt
def _convert(self, dt): # type: (_D) -> _D
if dt.tzinfo is not self:
return dt.astimezone(self)
return dt
def utcoffset(self, dt): # type: (Optional[_datetime]) -> timedelta
return self._utcoffset
def dst(self, dt): # type: (Optional[_datetime]) -> timedelta
return timedelta()
def fromutc(self, dt): # type: (_D) -> _D
# Use the stdlib datetime's add method to avoid infinite recursion
return (datetime.__add__(dt, self._utcoffset)).replace(tzinfo=self)
def tzname(self, dt): # type: (Optional[_datetime]) -> Optional[str]
return self._name
def __getinitargs__(self): # type: () -> tuple
return self._offset, self._name
class TimezoneFile(Timezone):
def __init__(self, path):
tz = read_file(path)
self._name = ""
self._transitions = tz.transitions
self._hint = {True: None, False: None}
UTC = FixedTimezone(0, "UTC")
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