Is it time to ditch the term millenium and bring on the kiloyear?

Time is a difficult unit. While on earth you have to account for where you are around it and the universal coordinated time. If on another planet, like mars, you need a conversion factor as the number of seconds in a year are different from earth's and the speed of the orbit needs to be accounted for. If on a ship going at super high speed, time dialation must be factored in. If in the presence of a strong gravitational field, time dialation also must be factored in.