If the power is turned off, does the clock remember the correct time?
When the power goes off, the clock ‘freezes’ all the settings, including the main time, the wake up times and brightness settings. Therefore if the power goes off for a few seconds and then back on, the time will have been paused for a few seconds. However if the power was off say for 3 hours, then the time will be out by 3 hours and will therefore need re-setting.