Description of Problem:
Can't use redhat-config-date at all. Selecting from menu results in no apparent
action.

Steps to Reproduce:
1. Install redhat linux 8.0
2. when prompted select (for example) UTC+1 as the timezone
3. after firstboot etc, select systemsettings->date&time from the gnome menu

Actual Results:
Nothing


Expected Results:
Date and time utility should open


Additional Information:
running from a terminal reveals the problem:

Traceback (most recent call last):
  File "/usr/share/redhat-config-date/redhat-config-date.py", line 35, in ?
    mainWindow.mainWindow().stand_alone()
  File "/usr/share/redhat-config-date/mainWindow.py", line 181, in __init__
    self.timezonePage = timezone_gui.timezonePage()
  File "/usr/share/redhat-config-date/timezone_gui.py", line 50, in __init__
    self.tz = TimezoneMap(zonetab, self.default, map=path)
  File "/usr/share/redhat-config-date/timezone_map_gui.py", line 139, in __init__
    self.setCurrent(self.currentEntry)
  File "/usr/share/redhat-config-date/timezone_map_gui.py", line 180, in setCurrent
    self.markers[self.currentEntry.tz].hide()
AttributeError: 'NoneType' object has no attribute 'tz'


Furthermore, /etc/sysconfig/clock contains:

ZONE="Etc/GMT+1"
UTC=true
ARC=false

and "Etc/GMT+1" does not appear in /usr/share/zoneinfo/zone.tab which causes the
problem.

The code in /usr/share/redhat-config-date/timezone_map_gui.py already looks like
its trying to handle this, but it doesn't work.