- origtz = os.environ.get('TZ')
- os.environ['TZ'] = "Europe/London"
- if hasattr(time, 'tzset'):
- time.tzset()
- try:
- return self._help_test_epoch()
- finally:
- if origtz is None:
- del os.environ['TZ']
- else:
- os.environ['TZ'] = origtz
- if hasattr(time, 'tzset'):
- time.tzset()