Windhoek is in Namibia and is currently on UTC+2. Its time zone is Africa/Windhoek.
Windhoek does not observe daylight saving time. It stays on UTC+2 all year, so the difference to any other place that also holds a fixed offset never changes.
The weekend in Windhoek falls on Saturday and Sunday. A working day of 9:00 AM to 6:00 PM is the assumption used on the board.