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I am active on Stack Overflow.
How to get my rank in specific time. ex: What was my overall rank at 1st of August?
The point is to compare it with my current overall rank to evaluate my progress.
You can see your rank in the week including August the 1st, using the arrows.
There you are #3707, compared to this week at #107.
As far as I know, there is no way to compare historically without looking at a large number of user's reputation graphs.
BTW, on August 1st you had 6976 reputation.