You could try running the numbers through angel numbers. 111 and 969 would be a good start, and if you search you can find some free lists on the internet, since this information should be available from multiple people.

I have received dates for past lives before as well. Fortunately that particular past life did stand out in history, at least enough to be recorded.

When searching, concentrate on the desire, the wanting, to know and happiness to know, that the answer to the question is waiting to be found out there.

You can always as spirit/source/guides/angles to repeat, increase the clarity of the message, or reinforce your need to know.