Showing timestamp of item value update in a mainUI card?

3

Create a secondary item like JustinG said:

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Select Timestamp on update or Timestamp on change.

Also if you want the time to be displayed for example like this:
2021-05-31 08:17:45
Go to the item and then add metadata:
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Add the state description:
and put this in for example: %1$tY-%1$tm-%1$td %1$tH:%1$tM:%1tS
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Then in the main UI card the code to display the formatted date for example is:
=items.Doorgarage_Doorgaragelastupdate.displayState

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It will show up in the properties in OH3 if you assign the properties:
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Hope that helps.

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