There are always a few trolls who complain about how other people spell their words, wear their hair, format their dates, choose their clothes, etc. Usually on HN these complaints get flagged into oblivion pretty quickly. But most people don't care, preferring to read about things like the interaction between technological development and digital art forms than complaints about whether "aluminum" should actually be spelled "alumium".
But I hate it. It makes most readers stumble over the dates, and it does so to grind an axe that is completely unrelated to the topic at hand.