One watch to rule them all, One watch to find them, One watch to bring them all, and in the darkness bind them.

I have one watch for the rest of my life, it must be:

1. Chronometer certified
2. Automatic movement
3. Highly water resistant, over 500m minimum, preferably 1000m, so you can actually take it diving all the time and not worry about failure.
4. Must display date in some form, but a minimum of day (number) of the month.
5. Must have one additional function; a chronograph, for example, but may be something else instead.

What watch should I get?

Answer: It looks like the Ball NEDU is the most capable of the suggested watches. Thank you all for your input.