Use quasiquotes to create a Tree in a macro.
object macro {
  def addCreationDate(): java.util.Date = macro impl.addCreationDate
}
object impl {
  def addCreationDate(c: Context)(): c.Expr[java.util.Date] = {
    import c.universe._
    val date = q"new java.util.Date()" // this is the quasiquote
    c.Expr[java.util.Date](date)
  }
}
It can be arbitrarily complex but it will be validated for correct scala syntax.