What save file bug? Only one I know of was the one where the save file got bigger if you looked at a lot of museum cards and eventually wouldn't work, but that was patched ages ago.
The date and time thing, I get that now and again (and sometimes it persists even when I "fix" it via the PS3 dashboard) but I don't think it affects anything else, so chill.
Actually I got the date and time thing around the same time as you, and just after I accidentally went into Playstation Home (instead of the store) and it made me download an update. Perhaps there is something that triggers it when doing that.
