Twilio was the most shocking example. They use that braindead[1] "RFC" style that includes day of week and month name in English. I remember feeling it looked like the most ugly part of their API; no reason for this silliness. (Maybe they've changed it since I looked a few years ago).
1: It made sense in like the early 70s when people read and wrote all headers by hand. It's been stupid for a much longer time than it made sense though.
1: It made sense in like the early 70s when people read and wrote all headers by hand. It's been stupid for a much longer time than it made sense though.