The most obvious choice is between "these days" and "in those days". The former refers to the present time, and the latter to a past time. " (past) If I've misunderstood the question then please provide some example sentences.
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Mieszko PowroznikWell, I have noticed that they are used interchangably in refrence to the present
AnonymousCan I use "these days" for the future time?I don't see how you could. Do you have a hopeful example?