To me, Truth is simply what is the case. It is not a matter of reasoning, and it could not be otherwise. Knowledge is a set of beliefs which accord with reality (what is true). Beliefs can be false. Knowledge cannot be false, by definition, because it must fit with what is. (Perhaps this is Pragmatism, I just started reading about it.)
So, my question is: if Truth is simply what is, and we accept that what is can change over time, is the state of Truth something like a Dirac Delta Function: It has a value of 1 at one point of time, and 0 at every other point of time? (See the linked Wikipedia article for a diagram)
Addition: The idea I had in mind was to contrast with another function (diagram) which looks like this: before now, the probability (or actuality) of a state of affairs was zero. After now, it slowly and continuously rises, as it becomes "possible to occur". This is how the Ego looks at the world: "What I want has not happened yet, but as I look to the future, it can, and is more likely over time." The Ego is wrong. What happens has 100% chance of happening, right now, and what does not happen has 0 chance of being the case. This is always true. Things do not "get better", they just ARE.