I am interested in your claim that DB2 maybe does date maths bettert han PostgreSQL. I use both quite regularly and find DB2 to be clunkier, less consistent, weaker in its handling of timezones and missing all sorts of operations. But I am probably biased and possibly failing to research DB2 as thoroughly...

... so those dodgy yanks will just be able to download the whole lot on day one -- unless you purchase my new tinfoil wallet at a low introductory offer of $99.99, that is!