Phnom Penh is in Cambodia and is currently on UTC+7. Its time zone is Asia/Phnom_Penh.
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Phnom Penh does not observe daylight saving time. It stays on UTC+7 all year, so the difference to any other place that also holds a fixed offset never changes.
The weekend in Phnom Penh falls on Saturday and Sunday. A working day of 9:00 AM to 6:00 PM is the assumption used on the board.