In and of Himself, no, there was never a time. However, it seems clear that the context is His being sanctified FOR our sakes. For example:
So, Jesus "became" sanctified so that He was our sanctification. That seems to match John 17:19 - "19 For them I sanctify myself, that they too may be truly sanctified."
Paul simply states that "we" have become righteous, holy and redeemed through him, not that he became holy, just or redeemed. It still doesn't answer: why did Jesus need to be sanctified?
So, Jesus "became" sanctified so that He was our sanctification. That seems to match John 17:19 - "19 For them I sanctify myself, that they too may be truly sanctified."
No it doesn't. God says to his people "be holy because I am holy." He doesn't say "I make myself holy so that you may be holy." Only someone who is not sanctified can become sanctified. And on another occasion, Jesus asks the Father to sanctify him...yet in John 17 he sanctifies himself..etc.
The Bible is full of these little inconsistencies. I love the one where Jesus says they can't touch him because his body was not glorified yet (!). When did his body become "profane"? LOL. They were shooting in the dark, FK. And once you realize that, the magic is gone.