Mindfulness and Mental Time Travel

We engage in mental time travel more often and more disfunctionally. When we're in the past or the future, our attention is also in that moment. And it ends up that it drives down mood. So why mindfulness? Well, if attention when it's not functioning properly causes problems for us. What if we could train the mind to be present centred more often and watch for where it is so that we can bring it back to being present centred when we need to?