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from django import VERSION, conf
from .base import TimeZoneNotFoundError
USE_PYTZ_DEFAULT = getattr(conf.settings, "USE_DEPRECATED_PYTZ", VERSION < (4, 0))
tz_backend_cache = {}
def get_tz_backend(use_pytz):
use_pytz = USE_PYTZ_DEFAULT if use_pytz is None else use_pytz
if use_pytz not in tz_backend_cache:
if use_pytz:
from .pytz import PYTZBackend
klass = PYTZBackend
else:
from .zoneinfo import ZoneInfoBackend
klass = ZoneInfoBackend
tz_backend_cache[use_pytz] = klass()
return tz_backend_cache[use_pytz]
__all__ = ["TimeZoneNotFoundError", "get_tz_backend"]
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