Hi,
I can't seem to find a place to submit this, even in the bug reporter.
I repost here as it's still broken in current betas.
iOS 11 has been completey broken with calendars outside of Gregorian (worked "nearly" perfectly for prior versions of iOS).
Easy to reproduce, just switch the Calendar in Settings>General>Language & Region to "Japanese" for example, while keeping display language (iPhone Language) in English, and observe the system (anything, for example open the Clock app and go to Stopwatch).
Everything from Era, timers, players (video, music in current or remaining times), etc (anything that displays date or time) is broken, at the very least in display.
Thankfully, for most apps this is just a display/UI bug, bug it also in many cases causes things to not function correctly (health data saved with few thousand years mistake, Siri failing to create a reminder or event in the calendar unless it's also randomly few thousands years off, etc).
I filled a bug report ( rdar #34573910 ) for quite sometime, but not finding the correct category maybe it's being ignored for later (other bugs I filled that are much less important have been processed way faster meanwhile).
Any admin here who can help accelerate the bug rport or give any pointers on where and how? (this concerns the system, both iOS and watchOS)
Thanks