"Mom, do you remember how we went to a store yesterday to see a crocodile?... Yesterday.." Asked Yuri. Even at his age the time is very relative. The things we remember well seem to be less distant than the things we don't remember, or don't want to remember. A diary helps keep things in perspective, and also makes you realize how your memories evolve with time. Past is never static.
I believe this very disorienting concept is called "mind time". A concept of time being bendable (just like any other measure in the physical world). Frankly, I'm unsure what is more real: the mind time, with it's elasticity and intensity, or the time of the clock, that we always have to check because it's never in phase with our lives. I chose not to say to my son that we've seen the crocodile in the store about two months ago. The two clock arms don't mater as much as our memories.