Method _change_tz

Lib/test/datetimetester.py:6897–6904

(cls, new_tzinfo)

    @classmethod
    @contextlib.contextmanager
    def _change_tz(cls, new_tzinfo):
        try:
            with os_helper.EnvironmentVarGuard() as env:
                env["TZ"] = new_tzinfo
                _time.tzset()
                yield
        finally:
            _time.tzset()

    @unittest.skipUnless(
        hasattr(_time, "tzset"), "time module has no attribute tzset"