It’s really just Date and Instant. Joda-Time isn’t part of the standard library. And if you’re listing Calendar, you might as well also list ZonedDateTime, Offs

It’s really just Date and Instant. Joda-Time isn’t part of the standard library. And if you’re listing Calendar, you might as well also list ZonedDateTime, OffsetDateTime, and LocalDateTime, not to mention stuff like java.sql.Date. In reality, there’s just one old API and one new API, similar to the old collection classes (HashTable, Vector, etc.) and the newer JCF ones.