Note On the main server, you need to select the time zone relevant to the server location. In the case of ESS or LSP, you must set up the time zone, which is the same as that of the main server. In a failover situation, the ESS or the LSP provide the correct time information to display on the phones with the help of the time zone and the translation information.
Configure date and time for the System Platform server. See Configuring the date and time for the System Platform server.