Use java.time

Everything is working with Calendar and Date now. Nowadays, i.e. also already in Java 8, the much nicer classes in java.time are available. It would also make more sense in many cases to not parse to a Date, but e.g. to a LocalDate ('tomorrow', '2025-08-10') a LocalDateTime ('tomorrow at noon') a ZonedDateTime (if timezone is indicated or implied) or an Instant ( 'winter solstice 2025’).