...you probably think I'm kidding, but i'm really not. This is just a weird case of the general problem: "how do I get other agents to do what I want". Assuming you can't reprogram them (and in real life, you kinda can), the answer is always "create incentives".
Simplest way to do this is trade, or the evil counterpart to trade: blackmail. Money usually works if you're dealing with a human. Beeminder is one existing tool for engaging in trade/blackmail with your future self.
(Just to make sure, this is a game and you aren't actually doing this, right?)
Reading a Reddit thread about the experiences of people who woke up after a long coma, got me thinking. If something similar happens to me, I might wake up with a significant portion of my memories gone (not to mention changes of personality). The question is, how do I make sure that the amnesiac future-me will continue to pursue the goals of present-me?
This can be divided into 3 sub-questions:
Any suggestions?
PS. You may ask, why am I focusing on goals? I'll just let agent Smith speak for me.