Use until datetime on rule based on datetime item

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1

Dear Colleagues,

As I’m not a programmer I’m facing some issues to create a basic rule and I need your support. I’m still using OH 3.4 as one non official binding was not tested on 4.

I’ve a rule to pick up datetime from when my alarm goes off: HouseAlarmOff.postUpdate(now.toLocalDateTime.toString()) and it’s working.

Now I’m trying to create a rule to check how many minutes passed from what I’ve into DateTime item HouseAlarmOff;

I tried:

var mins_between = HouseAlarmOff.zonedDateTime.until(new DateTimeType().zonedDateTime, ChronoUnit.MINUTES)

But it’s not working. May someone help me? I read that my I need to transform my DateTime Item to Zonedate to then execute “until” function but it did not work

2

You have to use JavaTime instead of DateTimeType (yes, it’s a bit confusing) - see

as an excelent reference.

3

Hi Udo,

sorry but I read and tried to cast datetime type to java but it did not work. I’m not sure if should then i created a string item and add date directly like java or if really is there a way to cast from datetime type to java.

Code:
val MyJavaTimeFromDateTimeItem = (HouseAlarmOff.state as DateTimeType).getZonedDateTime()
logInfo(“rules”, "minutes: "+ MyJavaTimeFromDateTimeItem)

Error:

==> /var/log/openhab/openhab.log <==

2023-12-07 17:30:50.858 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘alarm-4’ failed: Could not cast 2023-12-07T16:51:39.910279 to org.openhab.core.library.types.DateTimeType; line 77, column 39, length 35 in alarm

And

4

It isn’t clear to me what HouseAlarmOff means, and what you want mins_between to calculate? Is it the difference in time between HouseAlarmOff and now?

If that’s what you want, then:

val mins_between = Duration.between(HouseAlarmOff.state.zonedDateTime, now).toMinutes

Depending on whether HouseAlarmOff is in the past or in the future, you may need to swap the order of the two arguments above.

5

HouseAlarmoff is DateTime Item and I can’t cast it to zonedate to use between or until option. I guess now the mainly problem is how to convert correct DateTimeType to Zonedate, or how to save my item value on Zonedateformat

If I try to use hyour suggest I’ve got the following error: ‘alarm-4’ failed: ‘zonedDateTime’ is not a member of ‘org.openhab.core.types.State’; line 81, column 41, length 33 in alarm

6

Try

val mins_between = Duration.between((HouseAlarmOff.state as DateTimeType).zonedDateTime, now).toMinutes

I hate RulesDSL’s primitively verbose type casting. It makes a very messy code that is harder to read.

Consider switching to JRuby. This is the syntax in JRuby:

mins_between = (Time.now - HouseAlarmOff.state).to_minutes

Date/time calculation and comparisons, as with almost everything else, are much more straight forward in JRuby.

7

Hello, It did not work, I will consider switch to Jruby but we still have some DSL rules. Does anyone know how to save in ZoneDAte or cast DataTimeType to Zone date?

8

Any error messages?

9

Hello i’m sorry, I’ve forget to answer you…my bad.

Script execution of rule with UID ‘alarm-4’ failed: Could not cast 2023-12-14T08:10:03.816260 to org.openhab.core.library.types.DateTimeType; line 57, column 41, length 35

It’s the same error that can’t cast

10

Is housealarmoff a datetime item or a string item?

11

It’s a datetime item. I’m wondering if we can save date time in a string instead? I guess then I can save it using java time not?

12

Based on the error message, it seems that your HouseAlarmOff is NOT a DateTimeItem.

Try adding this line before the offending code:

logInfo("XXXX", "HouseAlarmOff type: {}", HouseAlarmOff.class)

Or you can just look at the item through the MainUI to check its type. I’m guessing it’s a StringItem.

13

Hello Tim, i’ve updated to OH 4.0.1 and not it’s working properly

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