Because humans are not computers. That scheme makes sense when you are filling out things that are not nearby in time. For example, filling in your birth date on tax forms.
Otherwise, humans don’t generally need the context of the year. The same is true of the month only if the context is clear (I’ll see you on the 20th implies the very next 20th). A year is much longer and most things are not planned out that far in advance. If they are, they often dont have precise dates in which case a month or even a quarter is more appropriate.
Time is also one of those things where humans are so used to contextual processing that representing the full date adds overhead. 2025/4/20, 4/20/2025, 20/4/2025 all take more processing than “the 20th” or “next Sunday”.
Because humans are not computers. That scheme makes sense when you are filling out things that are not nearby in time. For example, filling in your birth date on tax forms.
Otherwise, humans don’t generally need the context of the year. The same is true of the month only if the context is clear (I’ll see you on the 20th implies the very next 20th). A year is much longer and most things are not planned out that far in advance. If they are, they often dont have precise dates in which case a month or even a quarter is more appropriate.
Time is also one of those things where humans are so used to contextual processing that representing the full date adds overhead. 2025/4/20, 4/20/2025, 20/4/2025 all take more processing than “the 20th” or “next Sunday”.