put "Uptime: $[:if ([:len [:find [/system resource get uptime] "w"]] != 0) do={([:pick [/system resource get uptime] 0 ([:find [/system resource get uptime] "w"])] *7 + [:pick [/system resource get uptime] ([:find [/system resource get
 uptime] "d"] -1) ([:find [/system resource get uptime] "d"])])} else={[:pick [/system resource get uptime] ([:find [/system resource get uptime] "d"]-1) ([:find [/system resource get uptime] "d"])]}] days"

:put [/system/resource/get uptime
11w2d15:59:17
]

# rextended's function (thanks Master)
# Convert uptime to seconds
:global timetoseconds do={
    :local inTime $1
    :local wPos   [:find $inTime "w" -1]
    :local dPos   [:find $inTime "d" -1]
    :local itLen  [:find $inTime "." -1] ; :if ([:typeof $itLen] = "nil") do={:set itLen [:len $inTime]}
    :local itSec  [:pick $inTime ($itLen - 2) $itLen]
    :local itMin  [:pick $inTime ($itLen - 5) ($itLen - 3)]
    :local itHou  [:pick $inTime ($itLen - 8) ($itLen - 6)]
    :local itDay  0
    :local itWee  0
    :if (([:typeof $wPos] = "nil") and ([:typeof $dPos] = "num")) do={:set itDay [:pick $inTime 0 $dPos] }
    :if (([:typeof $wPos] = "num") and ([:typeof $dPos] = "num")) do={:set itDay [:pick $inTime ($wPos + 1) $dPos] }
    :if  ([:typeof $wPos] = "num")                                do={:set itWee [:pick $inTime 0 $wPos] }
    :local totitSec ($itSec + (60 * $itMin) + (3600 * $itHou) + (86400 * $itDay) + (604800 * $itWee))
    :return $totitSec
}

:local upd ([$timetoseconds [/system resource get uptime]] / 86400)
:put "Uptime: $upd days"

:put "Uptime: $([:tonum [/system resource get uptime]] / 86400) days"