If @ERROR <>0
  ;Do something
Else
  ;Quit
EndIf

If Not @ERROR
  ;Do something
Else
  ;Quit
EndIf

if $returnvalue=''
;report error
endif

If @ERROR OR $uptime=''
   "ERROR: Cannot retrieve uptime or uptime is null. Error code is ["+@ERROR+"] "+@SERROR+@CRLF
   If Not @ERROR $=Execute("Exit 4203") EndIf
EndIf

$Host = ''           ; define host that returns null data

WMIUptime($Host)[4] ?
@ERROR ' / ' @SERROR ?


;;
;;======================================================================
;;
;;FUNCTION       WMIUptime()
;;
;;ACTION         Reads the boot and current time from a defined host and
;;               calculates the length of time the system has been up.
;;
;;AUTHOR         Glenn Barnas
;;
;;VERSION        1.1 / 2007/04/05 - Authentication, rename to WMIUptime
;;			Adjustment for uptime across timezone changes
;;
;;SYNTAX         WMIUptime([host] [,AuthPtr])
;;
;;PARAMETERS     host    - OPTIONAL - name of system to query
;;
;;               AuthPtr - OPTIONAL - pre-authenticated WMI object pointer
;;                 Use WMIAuthentication() udf to create the AuthPtr value
;;                 AuthPtr is not needed if user has admin rights
;;
;;REMARKS        Gets both the boot and local time from the remote system, 
;;               eliminating issues with timezone differences between target
;;               and client. 
;;
;;RETURNS        Array containing Days, Hours, Minutes, and Seconds of uptime.
;;               Also returns the cTime value in element 4
;;
;;DEPENDENCIES   WMI support
;;
;;TESTED WITH    W2K, WXP, W2K3
;;
;;EXAMPLES       $Host = ''
;;               $Up   = WMIUptime($Host)
;;               $Host has been up for ' $Up[0] ' days!'
;;
;;               $Host = 'server'
;;               $objWMI = WMIAuthenticate('computer', 'userid', 'User-P@ss!')
;;               $Up = WMIUptime($Host, $objWMI)
;;               'Secure host ' $Host ' has been up for ' $Up[0] ' days!'
;
Function WMIUpTime(OPTIONAL $_Target, OPTIONAL $_pAuth)

  Dim $_Bt[3], $_Ct[3], $_U[4]			; time arrays for boot, current, and uptime
  Dim $_, $_O					; Index var, Offset flag
  Dim $_B, $_C					; boot and current time strings
  Dim $_Bo, $_Co				; boot and current time offsets
  Dim $objWMIService, $colItems, $objItem	; WMI object vars

  $WMIUptime = -1				; default to invalid value
 
  $_Target = IIf($_Target, $_Target, '.')
  If InStr($_Target, '\') $_Target = Join(Split($_Target, '\'), '') EndIf
  If $_pAuth
    $objWMIService = $_pAuth
  Else
    $objWMIService = GetObject('winmgmts:{impersonationLevel=impersonate}!\\' + $_Target + '\root\cimv2')
    If @ERROR Exit Val('&' + Right(DecToHex(@ERROR), 4)) EndIf
  EndIf
  $colItems = $objWMIService.ExecQuery("Select * from Win32_OperatingSystem",,48)

  For each $objItem in $colItems

    $_B = $objItem.LastBootUpTime	; host-local boot time
    $_C = $objItem.LocalDateTime	; host-local current time
'B: ' $_B ?
'C: ' $_C ?

    ; format is YYYYMMDDhhmmss.ssssss+ooo (or -ooo)
    ; Get the timezone offset. The offset will not play into the calculation unless
    ; the timezone switched between reboots, such as going from Standard to DaylightSavings
    If InStr($_B, '-') Or InStr($_B, '+')
      $_Bo = Val(SubStr($_B, 23))	; boot timezone offset
      $_Co = Val(SubStr($_C, 23))	; current timezone offset
      $_O = ($_Co - $_Bo) * 60		; find the difference, usually will be zero
    EndIf

    ; strip off the fractional seconds and time zone offset value
    $_B = Split($_B, '.')[0]
    $_C = Split($_C, '.')[0]

    ; format is now YYYYMMDDhhmmss - put into array
    $_Bt[0] = Val(SubStr($_B, 1, 4)) - 2000
    $_Bt[1] = Val(SubStr($_B, 5, 2))
    $_Bt[2] = Val(SubStr($_B, 7, 2))
    $_Bt[3] = 1.0 * SubStr($_B,13) + 60.0 * SubStr($_B,11,2) + 3600.0 * SubStr($_B,9,2)
    $_Ct[0] = Val(SubStr($_C, 1, 4)) - 2000
    $_Ct[1] = Val(SubStr($_C, 5, 2))
    $_Ct[2] = Val(SubStr($_C, 7, 2))
    $_Ct[3] = 1.0 * SubStr($_C,13) + 60.0 * SubStr($_C,11,2) + 3600.0 * SubStr($_C,9,2)


    ; Convert dates to Days, then convert to seconds and add the time value
    If $_Bt[1] < 3
      $_Bt[1] = $_Bt[1] + 12
      $_Bt[0] = $_Bt[0] - 1
    EndIf
    $_B = $_Bt[2] + ( 153 * $_Bt[1] - 457 ) / 5 + 365 * $_Bt[0] + $_Bt[0] / 4 - $_Bt[0] / 100 + $_Bt[0] / 400 - 306
    $_B = CDbl($_B) * 86400.0
    $_B = $_B + $_Bt[3]
    If $_Ct[1] < 3
      $_Ct[1] = $_Ct[1] + 12
      $_Ct[0] = $_Ct[0] - 1
    EndIf
    $_C = $_Ct[2] + ( 153 * $_Ct[1] - 457 ) / 5 + 365 * $_Ct[0] + $_Ct[0] / 4 - $_Ct[0] / 100 + $_Ct[0] / 400 - 306
    $_C = CDbl($_C) * 86400.0
    $_C = $_C + $_Ct[3]

    ; Calculate uptime as cTime, then convert to days / hours / minutes / seconds
    $_ = $_C - $_B + $_O
    $_U[4] = $_			; return the cTime value
    $_U[0] = Int($_ / 86400)
    $_ = $_ Mod 86400
    $_U[1] = $_ / 3600
    $_ = $_ Mod 3600
    $_U[2] = $_ / 60
    $_U[3] = $_ Mod 60

 Next

  $WMIUptime = $_U

EndFunction

$WMICheck = WMIConfirm('$computer')
    If $WMICheck
      Do what i need done.
    else
      Do Error proccessing.
    endif

$Host = '$computer'           ; define host that returns null data

$uptime = WmiUptime($Host) ?
@ERROR ' / ' @SERROR ?
? $uptime[0]
Sleep 5

B: 20080117171637.181125-300
C: 20080227145756.992000-300
3534079
0 / The operation completed successfully.