kolighan

Hi guys, as per title, I need to transfer a car I've had in trade for 6 months to my personal name. Can I back date this to 6 months ago? If so is it better to send the V5 off or do it online and say i've sold the car to myself. I know its been discussed before but can't find the thread. Car has been taxed since I bought it. tweakbox appvalley https://vlc.onl/ Thanks in advance.