Unfortunately, the year (the first two digits) doesn't update. I just realized that this thing has been stuck in the star year 61xxx (I used 1984 as the start year) for the last two years!
I've never seen prefixes used with a stardate converter before. I've cross refrenced some dates and they appear correct, such as 2323, but can you explain what the prefixes are used for?
I know the widget has a display problem for the versions 1.3.1 and lower... I submitted an update to fix it weeks ago, but it looks like it's stuck in the pipes... I can only hope it's validated soon. Sorry for that. :/