Business.php

<?php

class Business extends PgModel 
{
  // your stuff
}

PgModel.php

<?php

class PgModel extends Model
{
    public function getDateFormat()
    {
        if(env('DB_CONNECTION') == 'pgsql')
            return 'Y-m-d H:i:sP';
        return parent::getDateFormat();
    }
}