During his time on Dragonmount. However, I doubt that Rand will remember everything from all his lives now and already knows how to beat the DO. That would be a bit too simple. Rand still has to figure this out with the help of Min, his other girls, Cadsuane, Moiraine, etc.

I also don't think that Rand is completely "Cleansed" now. He laughed at the end of TGS, but still has to shed tears (maybe when he meets Moiraine again). And after all, Rand's thread in the Pattern is still welded with Moridin's thread due to the balefire crossing.