ANSWER - There is no spell that will enable you to physically travel back through time. Nor at this stage of our technical development is there any non hypothetical way of doing so. I believe there is a physics theory corresponding to travelling at light speed in which time travel is technically possible but this is into the future and not the past. (Mind I'm no scientist so any physicists are welcome to expand on this in the comments.)
You can travel back through time to some degree with the mind. This would depend on what you want to achieve though. If you want to relive and influence your own current life which by the way you have phrased the question I suspect you do then I am afraid there is no simple way to do so. I say it like this because some witches do consider that magic can work backwards as well as forwards and therefore might believe anything you did on this specific date could technically be reversed. This isn't my viewpoint though - in your situation I'd be focusing on spell work to mitigate the influence of whatever has happened.
So I'm sorry, I can't help you go back in time. I will offer the advice however that there is little you can do to permanently screw up the rest of your life in just over a month so although you can't actually go back and undo it you've probably still got enough to work with to get back on track.