Marginal Revolution has a post on domestic violence with a link to a paper on inconsistent time preferences. Wikipedia defines dynamic preferences as preferences that change over time.
For example, "Government policy makers also suffer from dynamic inconsistency, as they are best off promising that there will be lower inflation tomorrow. But once tomorrow comes lowering inflation may have negative effects, such as increasing unemployment, so they do not make much effort to lower it. This is why independent central banks are believed to be advantageous for a country: some believe they worry about making decisions for the greater good, not to keep government policy makers popular."
Basically, if you change your mind you have dynamic time preferences. I think is like discounting the future.