Modify the Date, Time, and Time Zone
The date and time are set when the array is created. However, you can change the date, time, and time zone at any time.
Modifying the date and time for an array.
$ date --edit 2015-09-30 12:00:00
Modifying the time zone for an NTP server.
$ group --edit --ntpserver 10.25.55.155
$ timezone --set Europe/Stockholm