- * Converts an {@link OffsetTime} to a {@link GregorianCalendar}, by converting
- * it into a {@ZonedDateTime} at the date of {@link Instant.EPOCH} and
- * then convering that {@link ZonedDateTime} into a {@link GregorianCalendar}
- * as suggested in the official Java 8 Time tutorial.
- * <p>
- * The {@link GregorianCalendar} can then be persisted as
- * {@link java.persistene.TemporalType.TIME} with the help of the
- * {@link java.persist.Tmporal}-annotation.
- * @see https://docs.oracle.com/javase/tutorial/datetime/iso/legacy.html