How can I change global date format in Android 7.1.1?

I want to continue using en-US locale setting, but with ISO date format YYYY-MM-DD. And change long format into DD. MMMM YYYY (e.g. 22. october 2017).

I know that date format change is not possible via menu items in the user inferface. But perhaps is there some file in the filesystem where I can specify it?

  • I'm afraid, no. – iBug Nov 22 '17 at 15:37
  • This question arises since Android 6 (where the corresponding option was removed – see How to change date and time format on Marshmallow?), and for other languages as well (for me it e.g. truncated the year to 2 digits in some apps, and choosing a different locale didn't help) – so a more general answer covering that as well would be great. BTW: this is not Samsung specific, unfortunately (just saying as you chose that tag). – Izzy Nov 22 '17 at 17:44
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    @Izzy – thanks for note on the scope, I removed Samsung tag. And yes, maybe someone with enough reputation could become an Altruist :) – miroxlav Nov 22 '17 at 19:45
  • According to this YT video one could simply add another language to the existing one (that guy ended up with "English (India)" as first and "English (US)" as second language). That way it seems one can play with different locales while keeping the language. Apart from that, all I found matches what the answers here and on the linked question already said. Still wondering why that option was removed – and not brought back despite of people complaining. – Izzy Nov 22 '17 at 20:03
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    @Izzy – we all are searching the web. But isn't there anyone who simply understands Linux and points to proper place where the setting is stored? I also asked on Unix and Linux SE. I would expect that there are many developers who – if they do not already know the answer – simply look at the code (it is all open source, isn't it?) and extract the information from logic of the code.I am doing similar examination in Windows software, so >> – miroxlav Nov 22 '17 at 22:29

Try en-CA locale setting.

It uses well-formed English, as well as ISO units and formats.

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    This one is better. Long date format is still wrong. Are there files in file system where these settings can be manually edited into desired form (similar to Windows Registry) or is asking about such advanced changes off-topic on this site? I think we both know that formats for current locale are actually stored somewhere and can be changed there. – miroxlav Nov 22 '17 at 16:34

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