import datetime

UTC = datetime.UTC


def now() -> datetime.datetime:
    """Return the current datetime in UTC."""
    return datetime.datetime.now(tz=UTC)


def to_aware(value: datetime.datetime) -> datetime.datetime:
    """Convert a naive datetime to an aware datetime."""
    if value.tzinfo is None:
        return value.replace(tzinfo=UTC)
    return value.astimezone(UTC)


def to_naive(value: datetime.datetime) -> datetime.datetime:
    """Convert an aware datetime to a naive datetime."""
    if value.utcoffset() is None:
        raise ValueError("Cannot be applied to a naive datetime")
    return to_aware(value).replace(tzinfo=None)