Here's an amusing iOS 11 bug:
If an iOS device is set to the en-US locale and Siri is set to a British voice, when reading dates aloud, Siri transposes months and days. For example, given the command
Remind me Wednesday Morning to buy milk, Siri responds with
OK, I added it for Wednesday at 10/11/17 7:00. When reading this aloud, Siri reads it as
OK, I added it for Wednesday the 10th of November two thousand and seventeen at seven o'clock.
It seems kind of crazy to me the Apple is parsing the raw text shown on screen rather than having some kind of machine-readable tagged data. So weird!
I reported this to Apple. I guess we'll see if it gets fixed in iOS 12.