Spells to alter time are simply fantasy. One cannot make time go faster or slower, go back in time, go forward in time, make time stop, or in any way change the way that time functions. You are not going to be able to find a time spell that works because none exist.
Depends what you're wanting. No spell can control time [speed/slow it or time travel] but if you wish to connect with a former life, there's past life regression, but that's not physical time travel [you usually skry or meditate] and your spirit will show you glimpses of your past life. I can't really help you with it though since I've never gone out of my way to do a regression, it sometimes happens when I'm in deep meditation, but again, never studied it beyond a basic level so I can't help.
Time is movement, and our perception of it can change to an extent, a good example is the phrase "time flies when you are having fun" or "a watched pot never boils", paying attention to the details of time will slow it down just like becoming oblivious to it will make it seem to speed up.