Yii Time formating

// Config file
'formatter' => [
       'class' => 'yii\i18n\Formatter',
       'dateFormat' => 'd-M-Y',
       'datetimeFormat' => 'd-M-Y H:i:s',
       'timeFormat' => 'H:i:s',
       'timeZone'=>'asia/kolkata'],
//// Controller file on head
use yii\i18n\Formatter;
//cod in controller
$timekey = Yii::$app->formatter->asdateTime(date('U'));[write this whenever you want to use, Here formatter is depend of confing gile]