How to remove time from publication date

Change publication date format from

January 3, 2017 at 12:39 pm

to

January 3, 2017

using this code

add_filter( 'feedzy_meta_output', 'tifd_fix_meta_output', 10, 5 );

function tifd_fix_meta_output( $content, $feed_url, $item, $meta_values, $meta_order ) {
	//Change publication date from 
	return str_replace( 'on', '', substr( $content, 0, strpos( $content, 'at' ) ) );
}