[slim]

Dates are actually always durations. But most time libraries design fail to aknowledge that. When you say something is 4 months away, it means you're probably happy with a 1 month resolution. 4 months from 31 July is November. 4 months from any day in July is always November.

[jimktrains2]

But 4 months from July 31 is Dec 1.

[granshaw]

Talk to any non programmer or mathematician on the street (aka your users) and they’ll expect the answer to be Nov 30.

[anchpop]

Reminds me of the old joke, why do programmers confuse Halloween and Christmas? Because DEC 25 is OCT 31

[slim]

that's 123 days from July 31 not 4 months from July 31