It is thought that the changeover from hunter to farmer was a slow, gradual process.
Dieting on New Year's Day isn't a good idea as you can't eat rationally but really need to be free to consume whatever is necessary, moment by moment, in order to ease your hangover. I think it would be much more sensible if resolutions began generally on January the second.
It is about this very abstract sense of displacement that he feels the moment he turns off the television.