Remove Gigasecond; it's worthless in Java.

All the interesting date math that this exercise probably brings in other languages is roundly covered with the built-in java.time package.

Worse, every solution I’ve seen submitted is nearly identical and so there’s no room for discussion.

Unless we see this as a way to introduce that part of the standard library (which generally isn’t the goal), this exercise doesn’t yield the good stuff we’re looking for.

[stkent]

FWIW, I watched someone complete this exercise today, and it was the first time they discovered and used multiple constructors, and the first time they learned you could call into one constructor from another!

[matthewmorgan]

That makes sense to me. Plenty of more valuable exercises…!