TYPO3 backend: date format

Date format in TYPO3 backend can be customized with:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy']
$GLOBALS['TYPO3_CONF_VARS']['SYS']['hhmm']

Rendering is done by TYPO3\CMS\Backend\UtilityBackendUtility::datetime

Example value:

'ddmmyy' => 'Y-m-d',