An application executing on a mobile device generates a geo-positional query including a time stamp representing the time of the query. The application can be, for example, an augmented reality application, a pointing search application, or a mapping application that searches based on geolocation and/or physical proximity. The query can include, in addition to a location, one or more of a direction, orientation, and camera field of view of the mobile device. A system processes the query to return a time-based state of an object and/or location addressed by the mobile device at the time of the query. The system can use the time stamp to identify which objects may have been located at a certain location at a certain time and/or to identify the state of located objects at a certain time. For example, the state of an electronic billboard can identify an advertisement displayed at the time.
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