For Central to work properly, it is important that the date, time and time zone are set correctly.
You can find the date, time and time zone in Central's settings. To do this, click on the cogwheel in Central's sidebar:
Click 'General' and then 'Localization':
In this screen, you can adjust the data. If you cannot adjust the settings, you must deactivate the 'Automatic date and time' option.