You&#x27;re right, correctness is important. And also wrong by thinking usability gets in the way of correctness<p>Usability helps with being correct<p>Vast majority of uses of cal apply to dates &gt; 1900 (and I&#x27;d say a significant amount is &gt; 2000)<p>&#x27;cal 16&#x27; should require a flag saying &quot;Yes, I know what I&#x27;m doing, this is the actual year&quot; and&#x2F;or print the corresponding year for this century (being explicit, when printing, to which year it refers to)