|John Titor's army symbol|
You can go to toilet, you can go to Africa or Venice, you can go to Moon or Jupiter... In other words you can go PLACES. But you can't go to the past because past is NOT a place.
Further on, supposed travel to the past would require some time, right? So, if you hit the time road now this very moment driving in super-speedy time capsule you will reach say 1981 tomorrow, right? Wrong! You will end up in the future (say in 2015), because all you can do is trade your day for couple of years on Earth - and that's possible in case your body can handle speeds near speed of light. But unlike the past, the future is a place and I can prove it to you in case you're patient enough to meet me here on this very page in 2015! BTW, unlike past, this page is a place you can come to.
From Christian perspective, traveling to the past is also not allowed. You have your time at disposal and freedom of choice to do whatever you want to do - even to travel to the future if you have means for that. But you can't make up for your sins simply by going to the past and fixing your past mistakes. Redemption is the only way out.
So Mr. Titor, I am sure you'll be reading this in 2030. I'll be here to approve your comment. But if you think time travel to the past is still possible, please meet me here last Thursday.