In a year from now, you will remember a particular memory, it doesn't have to be a year, it can be a month from now, a week or even tomorrow morning.
The memory might have been of some value for you, and when you lived that moment you did not thought of it, but reliving it again you analyze the details of the surroundings, the weather, the nature, the tone of your feeling, the way things are created.
Dès Vu is the conciousness that the moment you are living will become a memory. Its knowing it will soon be gone and all that is left for you is is that thought.
Everything there is are passing moments, time will eventually pass, consume the moment, but it can live on, in your head, as a memory, if you wish to share it, others that might have been in that moment will suddenly remember it, them and those who had not been there wil might start a conversation over it being the center of attention.
At the present time you can't connect the dots looking forward, but as a future you, remembering the moment you might suddenly acknowledge what impact it had on you.
You are a time traveler, going through your mind, living the different parts of your being, feeling once again what you felt when the memory had created.
Take a moment for yourself, live the moment for one last time before you carry on, somewhere in the future you will look back, make it worth something.