This conversation has been merged. Please reference the main conversation: How can I delete scrobbles with data unknown?
There was an official response in a thread acknowledging the issue several months ago, but it basically just said "Welp, you can't do that, soz".
I want to ask the Last FM staff directly: have you actually got any intention of bringing this functionality back and if so, when?
On a related note, will we also be able to delete artists, tracks, and albums from our libraries? Currently, we can only do this by deleting every single individual scrobble which is both tedious and not exactly user-friendly. Furthermore, if you come across a scrobble with an "unknown date" while trying to do this, you're stuffed! See why I bring this subsidiary point up?
Any users who would like this question/problem answered please chime in and follow/"me too" the thread, as thread activity/popularity is apparently a deciding factor the staff use to decide what issues need addressing.
I wait with baited breath!