Demonstrative adjectives are usually used as spatial references, but they can also be used to establish temporal references in order to refer to the present, the past and the future.
Este/esta/estos/estas
In the first example above, esta refers to present time (esta semana, i.e the current week) while in the second example, estos refers to a near future (estos meses, i.e the months coming).
Ese/esa/esos/esas
In the first example above, ese día refers to a past event while in the second example ese día refers to a future event.
Aquel/aquella/aquellos/aquellas
We can only use aquel, aquella, aquellos and aquellas to refer to a past event. Very often this use indicates an element of nostalgia. We do not use it to refer to present or future events.
In the examples above, aquel / aquella / aquellos / aquellas refer to a past event that is further away in the time in the speaker's mind compared to ese/esa/esos/esas.
Have a look at these two examples to see the difference:
In the first sentence, the speaker feels "closer" in time to the journey while in the second sentence the speaker sees it as a more "far away" idea, yet they are both referring to the same journey. So, using ese or aquel is sometimes subjective.
See also Adjetivo demostrativo.
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