Timer countdown vsible in human reading format

Setup, Configuration and Use Scripts & Rules
10

I made some slight modifications and it works. Appriciate your support very much @jimtng
How can we make it in the format of 01:20:59 ?

var Timer motionDelayTimer = null
var RuleFlag = null
val int timeoutMinutes = 20

rule "Office Motion Sensor ON" 

when 
    Item Office_Multisensor_6_Motion_Alarm changed from OFF to ON 
then
    if (RuleOfficeLight.state == ON){
        RuleFlag = true
        if(motionDelayTimer === null || motionDelayTimer.hasTerminated) {
            motionDelayTimer = null
            Office_FIBARO_Double_Switch.sendCommand(ON)
            Office_FIBARO_Dimmer.sendCommand(2)
            logInfo("Motion Office", "Movement recognised -> Light ON")
        }
        else {
            logInfo("Motion Office", "Movement recognised -> Timer stop.")
            motionDelayTimer.cancel
            motionDelayTimer = null
            CountdownItem.postUpdate(0)
        }
    }
    else{
        logInfo("Motion Office", "Rule deactivated")
    }

end

rule "Office Motion Sensor OFF"

when
    Item Office_Multisensor_6_Motion_Alarm changed from ON to OFF
then
    if(RuleFlag == true) { 
        CountdownItem.postUpdate(timeoutMinutes * 60) // reset the timeout
        logInfo("Motion Office", "No more movement -> Timer start.")
        RuleFlag = null
        motionDelayTimer = createTimer(now.plusSeconds(1), [ |
        
        val timeout = (CountdownItem.state as QuantityType).intValue 
        if (timeout == 0) {
            motionDelayTimer.cancel
            motionDelayTimer = null
            Office_FIBARO_Double_Switch.sendCommand(OFF)
            logInfo("Motion Office", "Timer elapsed -> Light OFF")
        } 
        else {
            CountdownItem.postUpdate(timeout - 1)
            motionDelayTimer.reschedule(now.plusSeconds(1))
          }
        ])
    }
    else{
        logInfo("Motion Office", "Rule deactivated already")
    }
end