That we perceive time as existing at all is due to the gravitational pull of our planet, and the way time is measured on Earth is a construct we created ourselves. Alien civilizations use other methods. For instance, on the planet Erra in the Pleiades star system, the passage of time is measured through events rather than dates, according to ET contactee Billy Meier.
On her channel The Grounded Starseeds, Abigaelle Richard gives an insightful video presentation, which I highly recommend, on how our experience of life can improve if we focus on living an event-based rather than time-based existence.