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try:
import zoneinfo
except ImportError:
from backports import zoneinfo
from .base import TimeZoneBackend, TimeZoneNotFoundError
class ZoneInfoBackend(TimeZoneBackend):
utc_tzobj = zoneinfo.ZoneInfo("UTC")
all_tzstrs = zoneinfo.available_timezones()
base_tzstrs = zoneinfo.available_timezones()
# Remove the "Factory" timezone as it can cause ValueError exceptions on
# some systems, e.g. FreeBSD, if the system zoneinfo database is used.
all_tzstrs.discard("Factory")
base_tzstrs.discard("Factory")
def is_tzobj(self, value):
return isinstance(value, zoneinfo.ZoneInfo)
def to_tzobj(self, tzstr):
if tzstr in (None, ""):
raise TimeZoneNotFoundError
try:
return zoneinfo.ZoneInfo(tzstr)
except zoneinfo.ZoneInfoNotFoundError as err:
raise TimeZoneNotFoundError from err
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