For almost a year now I own a PRS-T1 (not rooted) and only now it occurred to me that you do not see the current date/time anywhere, save for the config screens. Why I noticed it only now? Well, yesterday I did made some config adjustment and somehow at the top left of the black bar in the home screen I *DID* see the date/time appearing. Sadly, it went away when I selected the book I wanted to read and I could not make it visible again.
So, is there some (undocumented) feature to make it visible again?

It seems to be possible, but I cannot reproduce it.