Beginning of what?
As I said, "before the foundations". God knew His children before He created the Heavens and the earth, etc. We are not told much about what God was up to before He created, but this the Bible tells us.
If time did not exist, then nothing existed before. It's meaningless to speak of beginning when it comes to God.
I don't know when God created time. All we know for sure is that it was some time before Gen. 1:1 because God did not come into existence at that point. God preceded creation, as we know it.
No, FK, you said "This [God] knew from the beginning." My question is what beginning? If it is the beginning of the Creation, then He didn't know us before that. If it implies some other beginning, then eternity is not eternal, but subject to time. Therefore to say God knew from the beginning is incorrect; rather, God knows us for all eternity more properly expresses timlessness of God; the word beginning in not timless.