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The "time" command in Linux is a process timer and does not display the system time. Though counterintuitive, the Linux "date" command displays the time, as well as the date, on a Linux box.
Looking for the last, best system monitor you could ever imagine for the Linux desktop? Jack Wallen is certain he's found that tool in System Monitoring Center.
The sar command can provide detailed system metrics on just about every aspect of system performance. You can query it on as as-needed basis or set it up to provide daily reports.