Separate time settings from user locale? I would like to render the DateTime fields in the backend with european time format, even though the user I'm logged in with is set to English/US.



Is this possible?
No, there's currently no setting to choose your preferred date and time format. What you can do though, is to hack your craft/app/framework/i18n/data/en_us.php

'dateFormats' =&gt; array (
    'full' =&gt; 'EEEE, d. MMMM y',
    'long' =&gt; 'd. MMMM y',
    'medium' =&gt; 'dd.MM.y',
    'short' =&gt; 'dd.MM.yy',
),
'timeFormats' =&gt; array (
    'full' =&gt; 'HH:mm:ss zzzz',
    'long' =&gt; 'HH:mm:ss z',
    'medium' =&gt; 'HH:mm:ss',
    'short' =&gt; 'HH:mm',
),