OH 3 Time converting issue

[JustinG]

This is a pretty awkward way of getting the difference in days between two dates. I’m not 100% sure of the details here, but the necessary conversions between ZonedDateTime and LocalDate because of the use of withTimeAtStartOfDay (which I believe would be atStartOfDay here instead) will get long and complicated. You probably don’t need that part however and will still get the correct value (because of the math::round) with:

val varRestmuellDatum = Restmuell.getStateAs(DateTimeType).zonedDateTime.withHour(0).withMinute(0).withSecond(0)
logInfo("all.rules", varRestmuellDatum.toString())
val Long varRestmuellDiff = Math::round((varRestmuellDatum.toInstant().toEpochMilli() - ZonedDateTime.now().toInstant().toEpochMilli()) / (86400000.0))

However there are much more elegant ways of getting the difference between two timepoints. This post list some examples:

[SOLVED] Rules: calculate difference between 2 DateTime in minutes

ZonedDateTime… until… ChronoUnit.TemporalUnit… import java.time.temporal.ChronoUnit ... val date_1 = Virtual_DateTime_1.getStateAs(DateTimeType).zonedDateTime val date_2 = Virtual_DateTime_2.getStateAs(DateTimeType).zonedDateTime val seconds_between = date_1.until(date_2, ChronoUnit.SECONDS) val minutes_between = date_1.until(date_2, ChronoUnit.MINUTES) val days_between = date_1.until(date_2, ChronoUnit.DAYS) val weeks_between = date_1.until(date_2, ChronoUnit.WE…

Note the import and use of the ChronoUnit to avoid the messy conversions to millis and back and rounding and the .until method to directly get the amount of time between two datetimes.