I'm aware this is an old thread, but I thought I'd post just in case you or others happen upon it as I did.
I too had this problem after I was gifted an XP computer along with the Iomega 250GB drive but no installation disc.
The computer had the Discovery Tools software installed already which gave me a "non browser" option to communicate with the NAS. From the other computers on my LAN, I had to use my browser to access the web interface.
After discovering the "not beyond 2012" issue, I found that by first launching the Discovery Tools on the one computer that had it, the date and time on the Iomega was updated automatically to the system date and time of the computer. - Even though the dropdown still only went to 2012, if the computers date was past 2012, it was correctly changed on the Iomega.
What brought me here was that when the old XP died I no longer had "a fix". Searching the web told me I either had to root the linux based Iomega or get the Discovery Tools.
Not being very "linux savvy", I decided to first ask the original owner if he could double check to see if he had the install cd, and he was able to find it.
I was also told by the web that the installation cd would only work on an XP or earlier system. This is only partially true - at first my Win8 did reject it, but then asked me if I wanted to try "compatibility mode" and after saying yes, it installed and I was able to run the Discovery program and fix the date as before.
Now the strange part.... (again, I'm no expert) but from what I could tell, the only thing that the Iomega software does is map the NAS and give it a drive letter. Unfortunately, I too worn out from this stupid issue to "play with it" and see if just mapping the drive without the Iomega's software would work on any of my other LAN computers...also, don't know if this means anything, but I did noticed that the Discovery Tools interface insists on using IE even though that's not my default browser.
Anyway, hope this helps you or someone else.