Last Boot: who -b

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Working with AIX > Advanced Administration > Login Records (utmp, wtmp, failedlogin) > The Command who(1)

A system boot is recorded as a type 2 (BOOT_TIME) record in /etc/utmp and /var/adm/wtmp. With “who -b” the time of the last boot can be determined:

$ who -b
   .        system boot Jan 15 11:56                    
$

If you want to know when previous system boots have been, the file /var/adm/wtmp can be used together with “who -b“:

$ who -b /var/adm/wtmp
   .        system boot Jan 10 21:15                    
   .        system boot Jan 12 04:33                    
   .        system boot Jan 15 09:30                    
   .        system boot Jan 15 11:56                    
$