It’s really easy to figure out how long a system has been up and running on solaris. Absurdly easy.

uptime

The uptime command shows how long a system has been running.

Example:

# uptime
 11:57pm up 44 mins(s), 2 users, load average: 0.08, 0.13, 0.14

who -b

The who -b command will tell you exactly when the system was last started up, as opposed to telling you how long it’s been up. Saves you some math.

Example:

# uptime -b
     system boot  Nov 30 23:13