timeboot is an enhanced version of uptime which you can find
on the DevCD 2.1

If you want to know how many hours (or days ;) ) your Amiga
is switched on without a crash then timeboot is what you've
been searching.

8.Ram Disk:> timeboot
Boot time:    19:42:30
Current time: 23:45:29 

up for 0 days, 4 hours, 2 minutes

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2032    3628  56.0% -lh5- 6fac Dec  6  2001 timeboot
[generic]                  337     540  62.4% -lh5- 19f0 Dec  6  2001 timeboot.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    2369    4168  56.8%            Dec  8  2001