Mine

fuction uptime () {    (( secs = `date +%s` - 1150147140 ))    (( mins = secs / 60 % 60 ))    (( hrs  = secs / 3600 % 24 ))    (( days = secs / 86400 ))    echo " `date +%H:%M:%S`" up $days days, $hrs:$mins, `/usr/bin/uptime | sed -r 's/^.* ([0-9]+ user.*)$/\1/'`}