Hi,

I need your help.

How can I add an album and put an unknown date? I dont found that function

This to avoid putting productions on bandcamp with dates prior to 2008

Thanks a lot

You can't. If you don't know at least the year, it needs to go in the band's additional notes, like this.

Also see viewtopic.php?f=17&t=125696 for more info on how to handle Bandcamp releases.