The Creator gives us 24 hours a day. In those 24 hours, you can do many things, overgo through different states.
There are very meaningful, happy and memorable days. There are also days when you experience passimistic feelings and unhappy things.
Those happy days passed and became memories. Memories remind us that nothing lasts forever.
No joy is everlasting, and no sadness is forever. So don’t waste the precious time of your life just to remember the past, or worry about the future yet to come.
Enjoy every single day you live. Live your life in the present, live meaningful and memorable days, rather than counting the days you live.