I have a Lumia 950XL running Windows 10 Mobile on the Windows Insider Fast Track, with 10.0.14376.0 installed.
I'd like to customize my date format to be yyyy-MM-dd, like every sane person would.
Under "Region", I can specify "Canada" as the region, then "English (Canada)" as the "regional format". This shows the settings as:
Calendar: Gregorian Calendar Date: June 30, 2016 Time: 12:36 PM Currency: $
Below the "Regional format example" is a link -> "Change formats". This used to allow customization of the date format; however it no longer does that on my phone, electing simply to display a disabled drop-down that would (if it wasn't disabled) allow selecting the type of calendar you'd like to use.
Is there some other setting applet I can use to customize my date format?