Force the formatter to not convert the date

How can I oblige this function

Yii::$app->formatter->asDate($mydate,'php:D d-M-Y H:i:s')

to not convert the date I am giving it to the timezone of the application but only format it (display it) in the way I tell it?

I use formatter to take advantage of 18i for displaying the date but not to convert it to application timezone.