MikroTik

{
 :local date [ /system clock get date ]
 :if ( [ /ip hotspot user get $user comment ] = "" ) do={
  [ /ip hotspot user set $user comment="$date 30 Days" Or "$date 7 Days" ]
 }
}

{
 :local offset 30
 :global today

 {
  :local date [ /system clock get date ]
  :local montharray ( "jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec" )
  :local monthdays ( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 )
  :local days [ :pick $date 4 6 ]
  :local monthtxt [ :pick $date 0 3 ]
  :local year [ :pick $date 7 11 ]
  :local months ([ :find $montharray $monthtxt]  )
  :for nodays from=0 to=$months do={
   :set days ( $days + [ :pick $monthdays $nodays ] )
  }
  :set days ($days + $year * 365) 
  :set today $days
 }

 :foreach i in [ /ip hotspot user find where disabled=no ] do={
  :if ([ :find [ /ip hotspot user get $i comment ] ] = 0 ) do={
   :local date [ /ip hotspot user get $i comment ]
   :local montharray ( "jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec" )
   :local monthdays ( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 )
   :local days [ :pick $date 4 6 ]
   :local monthtxt [ :pick $date 0 3 ]
   :local year [ :pick $date 7 11 ]
   :local months ( [ :find $montharray $monthtxt ] )
   :for nodays from=0 to=$months do={
    :set days ( $days + [ :pick $monthdays $nodays ] )
   }
   :set days ($days + $year * 365)
   :if ( ($days + $offset) < $today ) do={ 
    :local name [/ip hotspot user get $i name]
    :log info "HOTSPOT EXPIRE SCRIPT: Disabling Hotspot user $name first logged in $date"
    [ /ip hotspot user disable $i ]
:foreach i in=[/ip hotspot user find disabled=yes] do={/ip hotspot active remove [find user=[/ip hotspot user get $i name]]}
   }
  }
 }
}

{
 :local date value=[/system clock get value-name=date];
 :if ( ([/ip hotspot user get $user value-name=comment]."") = "" ) do={
  /ip hotspot user set $user comment=$date;
 }
}