I was wondering if Allah knows the future why isnt the day of judgement today.

Allaah(swt) knows, but we don't.

A school teacher often knows the outcome of a test prior to giving it, so why don't teachers just give the grades and eliminate the work of allowing the tests to procede?

1) Like woodrow said, only Allah knows.

2) My own perspective on it is our life is like that of a fruit tree; Adam and Hawa were the first ''fruit tree plant'' and through means of life/procreation we have come to be living. They started the ball rolling and thus a self-sustaining circle of life is born - the child becomes the adult, the adult procreates a child - similarly, the parent fruit tree drops seeds, creating more fruit trees and so on and so forth (expansion, procreation etc etc).

In other words, we are part of the process.

However, just as all things have a beginning (for us human beings, adam and hawa - from a creationist standpoint), so to do they have an end; the day of judgement.

So, in simplest terms think of the D.O.J as the End of the process/everything, which also doubles as the time of judgement for all.

Edit; extra info

So, with the above let us get to grips with your actual question:
Why isn't the DOJ today?

Answer: the end of the process has yet to occur. Woodrow gave a good example too but for those who want a more in depth answer let us seek into it further:


Using the test example from woodrow's post above:
A school teacher knows that for a fact, two of his students will fail at the end of the year (cus they skive every lesson and when they do turn up they turn out to be complete thickos). However, he is a merciful teacher and grants all his students tests (to see if they at least can learn something and maybe change their life around). And whilst many will pass those tests with flying colours, the two he originally had pegged to fail d end up failling (because they fail all the tests given to them).

[One could argue about the lack of omniscience in a teacher, but we'll shift it to the side for this example since this one focuses purely on the test argument.]

So, does the school teacher being merciful (in giving his students a form of test) some how depowers his status as a teacher? Does the fact that those who flunked out mean the test was meaningless? No. The test was granted to the students as a gift of mercy: to allow them a fair chance. That is why he let them continue through the tests - mercy.

I'm short on time so I'll have to call it a day for now.