For linux, the 'date' command is used for manual setting of the system time (read the 'date' manual page for details). Obviously you have to log in as root to

For linux, the 'date' command is used for manual setting of the system time (read the 'date' manual page for details). Obviously you have to log in as root to set the system time. Or, follow the details from other commenters here to get ntp working, and let the system set its own time.