I don't remember when an event has happened, like for example if you asked me how long ago I broke up with my ex, I wouldn't be able to tell you. I tell length of time by how long it feels to me. like it feels like 4 years ago we borke up but it was probably more than 5.
I also forget particular conversations I have had. Some I remember verbatim, then others nothing stays with me at all. I think it is selective hearing and memory. Yet my long-term memory of the past is phenomenal. I can remember all of my ph numberds and addresses from my childhood and the names of kids I played with when I was 5.
So I don't understand how the memory operates, or how to control my own. Good luck with yours.