Comment by jackfranklyn

The timezone handling alone makes Temporal worth the wait. I've lost count of how many bugs I've shipped because Date silently converts everything to local time when you least expect it.

The ZonedDateTime type is the real win here - finally a way to say "this is 3pm in New York" and have it stay 3pm in New York when you serialize and deserialize it. With Date you'd have to store the timezone separately and reconstruct it yourself, which everyone gets wrong eventually.

Only downside I can see is the learning curve. Date was bad but it was consistently bad in ways we all memorized. Temporal is better but also much larger - lots of types to choose between.