There is a known issue in Windows Phone 8.1. The date/time format in calendar app does not respect the phone regional (date/time format) setting, but it follows the display language setting. For example, if I set the display language in English(US), and regional setting to Chinese. The date/time in all the places except calendar app will be shown in Chinese format, but in the calendar app, the date/time format is English(US).
There is a thread discussing this:
Windows Phone 8.1: calendar app does not follow regional - Microsoft Community
I wonder if Windows 10 for Phone fixes this issue, but I have a Lumia 930 so I cannot check it yet. Maybe somebody can check this? You can set your display language to English(US), and the regional (date/time format) to e.g. Chinese. And open the calendar app, to see which format the date/time is shown.
Thanks in advance.
There is a thread discussing this:
Windows Phone 8.1: calendar app does not follow regional - Microsoft Community
I wonder if Windows 10 for Phone fixes this issue, but I have a Lumia 930 so I cannot check it yet. Maybe somebody can check this? You can set your display language to English(US), and the regional (date/time format) to e.g. Chinese. And open the calendar app, to see which format the date/time is shown.
Thanks in advance.