How to update am Item of DateTime type?

Setup, Configuration and Use Scripts & Rules
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1

Using the latest stable OH3, perhaps a simple question:
I have created a DateTime item called MasterBedroom_Door_LastUpdate_Virtual
How do I set or update this from a rule or script?

Initially I would like to display on a mainUI page so I can know the door is still sending updates.
Later I would like to trigger/update an item if last update is > 1 day

I have spent hours on this, any help would be appreciated.

2

I created a DSL language script:

MasterBedroom_Door_LastUpdate_Virtual.postUpdate(now)

but get the error:
ReferenceError: “now” is not defined in at line number 1

3

In addition to also tried ECMAScript and Blocky script. Not clear how to get the current date time into a DateTime Item.

I looked at this page: DateTime Conversion (openHAB 3.x)
But I am not clear how this helps me.

I also looked at this, but it is not clear how this could help me: OH3 Setting current DateTime to a custom item in a rule - #2 by muelli1967

I would have thought it would be simple to record when something happened and display it. Am I missing something really obvious?

4

That’s simple enough that it should work.
Suggests there’s something amiss about the way you are entering this rule. Are you using GUI editing, or putting it in a text file? Copying old file-based rules into GUI system can go wrong, different triggering structure.

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5

I have been sticking to the GUI.
I recently updated to the latest stable, I wonder if there is an issue with my install.

6

Found a workable solution, you can also peak behind to see the code.

Decided to start over from basics and follow this:
https://www.openhab.org/docs/tutorial/rules_advanced.html

Was going to Administration → Settings → Add-Ons-> Automation to install this:
https://www.openhab.org/addons/automation/jsscripting/

However discovered a DateTime Block library

Which allowed me to do this:
image

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