I'm not a programmer, so my view may be a little bit skewed.. but this seems like a list of things that may or may not be correct (and I'd like to put things in a continuum, or percentages, or some other more practically observable other than a list) but it doesn't really get any further than that. How substantial many of the claims are?
I honestly doubt "programmers" get all these wrong. I'm not going to link to a post (I've seen some people replying with a post as if it's a substitute for actually saying what's wrong) or even say that "programmers" is a group too big and perhaps too inclusive to really have anything to say about them. I'll just link to esr's guide on hacking and ask the people who wrote the articles who they were dealing with. I doubt that the "hackers" being talked at esr's guide would do a thing like that. I'd also like to link to the suckless philosophy and ask if the "programmers" and software the writers were dealing with were really what what the suckless philosophy is completely at odds with.
If I ask most programmer or people of other domains whether all months have more than 27 days I think most of them would say, of course all months have more than 27 days. That if wednesday is the second of a month the following friday out to be the 4th of the months.
You actually need to know about the strangeness of september 1752 to know that there this one month in the calender who had less days. It had no days between the 2nd and the 14th.
Children get taught in school that minutes have 60 seconds and not that there a body that decides 18 months in advance whether the minute is supposed to have 59, 60, 61 or 62 seconds.
There are some long lists of false beliefs that programmers hold. isn't because programmers are especially likely to be more wrong than anyone else, it's just that programming offers a better opportunity than most people get to find out how incomplete their model of the world is.
I'm posting about this here, not just because this information has a decent chance of being both entertaining and useful, but because LWers try to figure things out from relatively simple principles-- who knows what simplifying assumptions might be tripping us up?
The classic (and I think the first) was about names. There have been a few more lists created since then.
Time. And time zones. Crowd-sourced time errors.
Addresses. Possibly more about addresses. I haven't compared the lists.
Gender. This is so short I assume it's seriously incomplete.
Networks. Weirdly, there is no list of falsehoods programmers believe about html (or at least a fast search didn't turn anything up). Don't trust the words in the url.
Distributed computing Build systems.
Poem about character conversion.
I got started on the subject because of this about testing your code, which was posted by Andrew Ducker.