Well, it's actually easy, the later - the better, but if you in rush, there's might not be a way back
But seriously, listen to your intuition, if it's well developed, it's could give the right date as well, or, it's might be given by GD or by Gods if u have a good conections with them. On my own, I can suggest making a tarot readings to help u somehow, usualy they're always works