try:
    # noinspection PyUnresolvedReferences
    import pytz

    def tz(tz_str):
        return pytz.timezone(tz_str)
except ImportError:
    import zoneinfo

    def tz(tz_str):
        return zoneinfo.ZoneInfo(tz_str)

from datetime import datetime, timezone


class Current:
    value = timezone.utc


_current = Current()


def set_current(tz_str):
    _current.value = tz(tz_str)
    pass


def get_current():
    return _current.value


def now():
    return _current.value.localize(datetime.now())


def make_aware(value):
    return _current.value.localize(value)