There will be a setting toggle to let user choose between 12/24 hour time format in v2.1. User story and settings spec: Bug 903683 For system app, the tasks to do after toggle is added would be: 1.Read/listen to the time format toggle value/change event. 2.Input the corresponding time format to existing mozL10n.DateTimeFormat() function. Currently the input time format should be a fixed 12 hour shortTimeFormat = %I:%M %p , line 201 of http://goo.gl/DR4CNe. There will be a 24 hour time format added. 3.Show the return of the function as it's doing now.

WIP, to demonstrate navigator.mozHour12 API shim usage.

Comment on attachment 8471310 [details] pull request redirect to github the patch did not cover lockscreen and time picker.

I think there's more to fix in System https://github.com/mozilla-b2g/gaia/blob/master/apps/system/js/lockscreen.js#L910 But most important https://github.com/mozilla-b2g/gaia/blob/master/apps/system/js/value_selector/value_selector.js#L482 Which determines how to display the time picker.

Comment on attachment 8471310 [details] pull request redirect to github What's the followup plan for lockscreen and timepicker?

Greg is proposing lockscreen patch in bug 1035754 now. For time picker it seems needs separate work and through test. So I'd fire a separate bug 1054135 as a followup for systemfe.

merged to gaia-master https://github.com/mozilla-b2g/gaia/commit/0cc4f10ffd9deb10056b4096021458fc1e34a9ee thanks!

After opening multiple apps and switching between 12hr, and 24hr Time Format it seems that the phone is correctly updating the system Time. However, I am unable to verify this bug due to its depends on not being verified yet (bug 1023735)