You have entered the murky world of recording history and I share your frustrations. Unfortunately, not all labels...big and small...kept archival information on artists, recording dates, etc. It leaves enthusiasts like most of Second Hand Songs users maddingly playing detective to find this kind of info. Sometimes starting with the label's catalogue number for a particular release can be the first step in sorting out release dates, but not always. I use on-line sources and a library of reference books on rock music (and some other genres) I have collected over the years. Yet even with these, sometime the only thing I can resolve is the year something was released. I am not looking for the actual day, but I am fanatical about the MONTH as well as the year. I is my fondest desire that people like us could start some kind of clearinghouse of accurate info on artists' recordings including year and month, label, catalogue number and chart activity if any. This would include single releases and album releases. Anyway, I've gone on too long here. Good luck with search...if I find anything, I'll pass it you way.
Peace