def METHOD_NAME():
    from dateutil.tz import tzutc
    from dateutil.tz import tzoffset
    from dateutil.tz import tzlocal
    from dateutil.tz import tzfile
    from dateutil.tz import tzrange
    from dateutil.tz import tzstr
    from dateutil.tz import tzical
    from dateutil.tz import gettz
    from dateutil.tz import tzwin
    from dateutil.tz import tzwinlocal
    from dateutil.tz import UTC
    from dateutil.tz import datetime_ambiguous
    from dateutil.tz import datetime_exists
    from dateutil.tz import resolve_imaginary
    tz_all = ["tzutc", "tzoffset", "tzlocal", "tzfile", "tzrange",
              "tzstr", "tzical", "gettz", "datetime_ambiguous",
              "datetime_exists", "resolve_imaginary", "UTC"]
    tz_all += ["tzwin", "tzwinlocal"] if sys.platform.startswith("win") else []
    lvars = locals()
    for var in tz_all:
        assert lvars[var] is not None