Here are two things each of us believes: (i) Other people have experiences; (ii) I had experiences in the past, and will continue to have them in the future. However, there is a challenge to (i), in the form of the conceptual problem of other minds (not to be confused with the epistemological problem of other minds): the circumstances under which we acquire the concept of ennui, for example, ought to prevent our extending that concept to other people. The question of this paper is whether there is a temporal counterpart of this problem. Do the circumstances in which we acquire the concept of ennui, and other similar concepts, prevent our legitimately extending that concept to the past or future? This question is linked to a question in the philosophy of time: is the distinction between past, present and future purely perspectival?