Click on the “login” link to download the app.
As you can see on the first screen, at the bottom, it says the certificate is expired (it is not).
On the second screen you can see that there is no such warning.
On the third screen you can see that, in fact, the certificate is not expired.
java version "1.7.0_21"
Java! (TM) SE R 1.7.0_21-b11)
Java HotSpot(TM) Client VM (build 23.21-b01, mixed mode, sharing)