examples/contacts-example/src/main/java/de/saxsys/mvvmfx/examples/contacts/util/CentralClock.java
public static void setFixedClock(ZonedDateTime zonedDateTime) {
		CentralClock.clock = Clock.fixed(zonedDateTime.toInstant(), ZoneId.systemDefault());
	}
public static void setFixedClock(ZonedDateTime zonedDateTime) {
		CentralClock.clock = Clock.fixed(zonedDateTime.toInstant(), ZoneId.systemDefault());
	}
This method is used to set the clock to a fixed time. This is useful for
tests. This way it's possible to create date/time instances with a
predictable value for your tests.