Saving a time to an Item and comparing later on

Setup, Configuration and Use Scripts & Rules
1

I’m coming close to giving up here. I’m using OH3.

My plan is simple: save the current time upon change (in an item); next change, compare and do things
I’m finding all sorts of info but it would seem the OH2 code no longer works for OH3.

First, how do I save the current time to an Item which later on I can use for comparing?
How do I compare if three hours have passed since latest update?

Do I save this as a number (seconds since epoch) and then compare it later?
Do I use this DateTimeType thing?

This all seems a bit overly complex for a reasonably common question I presume.

2

Search the forum before asking please.

3

That doesn’t solve my issue or either I’m missing it but.
How do I compare a date stored in an item.
And what kind of item would I use, datetime, number for seconds…

I get I could use now.isBefore but that doesn’t work with for example mydatetimeitem.state.

4

You first have to convert both comparison arguments to have the same type, see conversion post.
Then depending on type use .isBefore or >

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5

You might find some clues here

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