Grab a small notebook and and a pen.
Record the date.
Write a thought of the day to mull over as you go about your life.
Write a news headline that interests you to give your day some context.
Take note of interesting things people say, experiences worth remembering, books to read, goals, ideas, and inspiring quotes.
Remembering more will stretch out psychological time and keep your life from running together.
Make every day uniquely awesome; monotony collapses time, novelty unfolds it.
Flip through your life and avoid that, "Where did the time go?" feeling.
It's simple, but surprisingly life changing.