Marriage Date Calculated From Birth Date

You are correct in your assumption that your birth date can be used for numerology to calculate likely marriage dates. The online marriage date calculation tool is made to do the calculations for you.

The tool will respond with likely dates or periods, not only one psychically-determined date.

If you know who your spouse will be, calculate the likey dates for their birth date, too. See where their dates and your dates overlap. Those are then the most likely dates. The Calculating Your Marriage Date article describes how to do that.