I tried to do only minimum changes to the widget.
Vratislav Podzimek (2): TimezoneMap should handle "" timezone Add UTC and GMT-X timezones (#863199)
pyanaconda/timezone.py | 14 +++++++++++- pyanaconda/ui/gui/spokes/datetime_spoke.py | 35 ++++++++++++++++++++++++------ widgets/src/TimezoneMap.c | 35 ++++++++++++++++++++++-------- 3 files changed, 67 insertions(+), 17 deletions(-)