Why do some memories have a closer 'feeling' in time than others?
I've looked a bit into false memories/hearing, so my best answer to this would be that it has to do with emotional arousal and recency since the memory was last recalled. I don't think I've seen this exact question answered using neurological studies, but I have not really looked for a study addressing that specifically. So I'd say this could be a really interesting research project! I think the consensus is that emotional arousal leads to higher susceptibility to false memory because it would be more frequently recalled and therefore subject to alteration. Studying reported recall of dates and times would be really cool though.