Do our clock ticks when we are in Heaven or The New Jerusalem?
Are we still concerned about time? Today, tomorrow .............?
Or we do not care about time when we met our Lord?
Time is a tricky thing. Our perception of time here and now is based upon the current rules of how the universe functions. In the Standard Model of physics time basically comes down to motion--it's why things get really weird when we look at the math about approaching the speed of light, we get time dilation. If a person on a space ship reached a fraction of the speed of light and went on a trip, they might only experience a few weeks, a few months, or a few years (depending on the trip); but when they got back a sizeable amount of time may have gone by. It would be possible to take a space trip and return and see your great-great-great-great grandchildren grown up with hundreds of years having passed on earth.
And this also all relies on entropy, that everything in the universe is in moving toward equilibrium. A totally entropic universe would be one where nothing happens, every star has burned out, every planet decayed, every atom reduced to basically nothing. No light, no gravity, no energy, no matter--nothing. In such a universe, there wouldn't be any time--because nothing happens, nothing moves, it's just nothing.
So time is a real thing, it's part of the universe, it's something we experience as things happen, where there is motion.
In a universe without entropy, where there is no more death, where creation itself has been perfected and glorified--we wouldn't have entropy; but would we have time? Maybe. After all, there would be things--the heavens and the earth made new, with life--abundant, full, perfect life--and the experience of that full, everlasting, abundant life. But would it be time as we currently comprehend it? Nothing would decay, the affects of aging don't exist, would that register to us as time?
Perhaps because time depends on entropy, and without entropy, there would be no time; or perhaps our entire perception of what time is would be rendered meaningless?
In one sense, it all ends up being meaningless speculation, because we cannot even approach conceiving what that kind of life is like. I, you, all of us are limited to the experiences of being human here and now in a universe that is fallen, broken, and suffering under sin and death--we have no comprehension beyond this present mortal existence. And we can only peer, through a dim glass, to what God has promised when He makes all things new; revealed and brought to us through the resurrection of Christ, and the newness we have received now, through faith, as grace, as our union to Christ by the working of God through the Gospel; which is how we can see through a dim glass
at all.
-CryptoLutheran