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"""Shared helpers for working with the user's preferred timezone."""
from __future__ import annotations
from datetime import datetime, timezone
from typing import Optional
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
from ..logging_config import logger
from ..services.timezone_store import get_timezone_store
UTC = timezone.utc
def get_user_timezone_name(default: str = "UTC") -> str:
"""Return the stored timezone preference or a default."""
store = get_timezone_store()
return store.get_timezone(default)
def resolve_user_timezone(default: str = "UTC") -> ZoneInfo:
"""Resolve the stored timezone to a ZoneInfo, falling back to default on error."""
tz_name = get_user_timezone_name(default)
try:
return ZoneInfo(tz_name)
except ZoneInfoNotFoundError:
logger.warning(
"unknown timezone; defaulting to %s",
default,
extra={"timezone": tz_name},
)
except Exception as exc: # pragma: no cover - defensive
logger.warning(
"timezone resolution failed; defaulting to %s",
default,
extra={"error": str(exc)},
)
return ZoneInfo(default)
def now_in_user_timezone(fmt: Optional[str] = None, *, default: str = "UTC") -> datetime | str:
"""Return the current time in the user's timezone.
When *fmt* is provided, the result is formatted using ``datetime.strftime``;
otherwise the aware ``datetime`` object is returned.
"""
current = datetime.now(resolve_user_timezone(default))
if fmt is None:
return current
return current.strftime(fmt)
def convert_to_user_timezone(dt: datetime, *, default: str = "UTC") -> datetime:
"""Convert *dt* into the user's timezone with UTC fallback."""
if dt.tzinfo is None:
dt = dt.replace(tzinfo=UTC)
tz = resolve_user_timezone(default)
try:
return dt.astimezone(tz)
except Exception as exc: # pragma: no cover - defensive
logger.warning(
"timezone conversion failed; defaulting to %s",
default,
extra={"error": str(exc)},
)
return dt.astimezone(ZoneInfo(default))
__all__ = [
"UTC",
"convert_to_user_timezone",
"get_user_timezone_name",
"now_in_user_timezone",
"resolve_user_timezone",
]
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