[automation] Add basic time-related classes for usage in script and rules

[cweitkamp]

• Added basic time-related classes for usage in script and rules

This allows to use DateTime functions a lot easier for users without defining additional imports. We have public methods in different types which makes use of these classes e.g.

openhab-core/bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/DateTimeType.java

Line 170 in a9504bf

public DateTimeType toZone(ZoneId zoneId) throws DateTimeException {

openhab-core/bundles/org.openhab.core.model.script/src/org/openhab/core/model/script/actions/Timer.java

Line 76 in a9504bf

public boolean reschedule(ZonedDateTime newTime);

org.joda.time API has a method DateTime.now().withTimeAtStartOfDay() which was used by many users. The replacement is ZonedDateTime.now().truncatedTo(ChronoUnit.DAYS).

Duration class allows easy calculation of differences between two timestamps (Duration.between(Temporal startInclusive, Temporal endExclusive) - ZonedDateTime implemets Temporal interface).

Signed-off-by: Christoph Weitkamp github@christophweitkamp.de

[kaikreuzer]

The replacement that I am actually using in my rules is

now.toLocalDate.atStartOfDay.atZone(ZoneId.systemDefault)

but it all isn't as nice as the withTimeAtStartOfDay from old Jodatime. 😞

[kaikreuzer]

lgtm, thanks!