UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0

Example URL:
https://codepen.io/anon/pen/QgaPVm

Steps to reproduce the problem:
1. Have a system locale that uses the 24h time format
2. Have the en_US locale set in Chrome
3. Go to any site with <input type=time>

What is the expected behavior?
The time field should use 24h format

What went wrong?
The time field uses 12h AM/PM format

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 60.0.3112.40  Channel: beta
OS Version: Windows 7
Flash Version: Shockwave Flash 26.0 r0

There are many users who prefer not having localized software since the English language version is usually better than any translation (especially when it comes to technical terms). However, for things like date/time formatting (and any other culture/locale/region-specific formatting) the browser should do what pretty much any other application does and use the system settings OR provide separate settings for the browser's UI language and the locale used for formatting etc. (defaulting to the system settings)