Jeremy is unsure what to make of the idea of 'timeless' facts, if this is not just to say that they are true at all times. One way to grasp the distinction is to start with a temporary object, like a speck of dust, and then imagine that it just happened to exist at all times. Then 'the speck exists (now)' is true at all times, but in a very different way from how 'the speck exists at t1' is true at all times. Only the latter fact is timeless.
This difference may also be revealed in the modal properties. A timeless proposition will typically still be true even if you added extra times. (An exception: call the final moment of the universe tN. It's a timeless fact that tN is the final moment. But if we added an additional moment, tN+1, then this would no longer be true at all.) On the other hand, something merely contingently 'true at all times' might not remain true if we added an additional time, say a moment that no longer contains any specks of dust. [Are there exceptions in this direction too? Try to think of a temporally immanent fact that is nonetheless necessary, so that it would also be true in any additional times that might be added. Perhaps "that there is space (now)"?]
I guess the principled way to state the distinction is to say that some things are true at all times because of what's immanent, present, or 'going on' at each time; whereas other (timeless) propositions are true at all times for a "cheaper" reason. A timeless truth doesn't need truthmakers at each time; it just has a single truthmaker (say, the speck's existing at time t1) which suffices for it to be true at all times, whatever else may be going on at them. Though technically true at all times, it isn't really about all times in any deep sense.
Anyone got a neater way to word all this?