Converting rule to OH3 --> Issue time

Hi!
Since two days I’am trying to convert follwing rule (thank you to the guy who scripted it) to OH3. The rule is generally working, except the time issue (lastBelow6A = Grid_Power.previousState(true).timestamp.time). I tried different approaches out of examples in the forum, but I cannot get it working. I also created a DateTime Item, which stores the Timestamp of the last change for Grid_Power…no luck (thx to @rlkoshak for all the tutorials, but I didn’t manage it…)

Could anybody help me please


val switchOffTimeout = 20 // stop charging if current is below 6A for specified seconds
var long lastBelow6A = 0
if (lastBelow6A == 0) {
            // store time when below 6A for 1st time
           lastBelow6A = powGrid.previousState(true).timestamp.time

        }

        val secondsBelow6A = (now.toInstant().toEpochMilli() - lastBelow6A)/1000
        if (secondsBelow6A > switchOffTimeout) {
            logInfo("Wallbox", "Below 6A for " + secondsBelow6A + "s, switching off.")
            GoeCharger_AllowCharging.sendCommand(OFF)
            return
end

One of my not working changes:

        if (lastBelow6A == 0) {
            // store time when below 6A for 1st time
           lastBelow6A = (powGrid.previousState(true) as DateTimeType).zonedDateTime.toInstant.toEpochMilli

        }

        val secondsBelow6A = (now.toInstant().toEpochMilli() - lastBelow6A)/1000
        if (secondsBelow6A > switchOffTimeout) {
            logInfo("Wallbox", "Below 6A for " + secondsBelow6A + "s, switching off.")
            GoeCharger_AllowCharging.sendCommand(OFF)
            return
        }

Herbert
Here is a link to Rud’s great date/time conversion thread for OH3
start there