Step back in time and fix the past. If a return to the idea at that time not yet fully leave only memories. If patience is greater than this will not return the missing time regrets.
Edit it back in time to the past. If you have to change the mentality at the time. Still do not fully Leaving only memories If this patient will not regret the lost time.
Go back and fix the past. If you go back to change your mind at the time, also do not fully, leaving just a memory If be more patient will not back the missing.