There are a couple, weird exceptions with extremely limited applications that have to do with malfeas. In malfeas, if something happens you don't like and you get to a sympathetic yozi and convince them to help you out within 5 days they can sort of undo it but not really. But you don't travel through time, the event just never happened. But only to you.

Also, you can send a message back in time 5 days by summoning a demon. Kind of-ish.

But yeah. Actions have consequences and all that, and no time travel.