Date Time Nemesis

The silent scream of every developer who's dealt with international date formats. ISO 8601 (YYYY-MM-DD) is the logical standard that brings order to chaos. Meanwhile, the USA stubbornly clings to MM/DD/YYYY like it's clinging to the imperial measurement system. The dog doesn't bite, but watching Americans format dates MM/DD/YYYY will absolutely cause psychic damage to any developer trying to sort dates alphabetically. The pain is real.