You can access to date/time configuration in → and → .
At → , you can adjust eBox date and time. There are two different options to adjust date and time correctly: by hand, setting as "Disabled" NTP Server synchronisation, and using an external NTP Server, setting as "Enabled" NTP synchronisation.
If synchronisation with other NTP server is disabled, date and time adjust will be manual. Selecting corresponding values, shown in the page, for system date and time values.
If date/time synchronisation with a NTP Server is enabled, another configuration will be shown, where you can specify until a maximum of three NTP Servers where eBox will ask for date and time, using current timezone from the system configuration.
At → you can configure the system timezone. You just need to select you geographic zone from the list at the left, and a city from the list at the right, both belonging your time zone, and accept your configuration.
When you make a change, it is possible your system becomes unstable, so you'd better to restart the whole machine after saving changes.