Data and Materials for Everyday Thoughts in Time: An Experience Sampling Study of Mental Time Travel Abstract Time is among the most important yet mysterious aspects of experience and reality. We investigated the antecedents and consequences of in mental time travel, especially into the future. A community sample (N = 492) was contacted at random points during their daily lives and asked to report on their most recent thought. Analyzing more than 6,500 observations, we found that thoughts about the present were frequent, thoughts about the future also were common, and about the past were rare. Thoughts focused on the present moment were more pleasant but less meaningful than thoughts about future and past. Much thinking was pragmatic; in particular, the majority of thoughts about the future involved planning. Some thoughts had no time aspect, and these tended to be less emotional, less voluntary, and more focused on oneself than other people, as compared to thoughts that did have time. Social interaction increased thoughts with a time aspect (i.e., about the past, present, and/or future) with a specific increase in focus on the present. Thoughts about the past were relatively unpleasant, involuntary, focused more on others than self, and more common among people with troubled or troublesome personalities. Subjective experiences of past and future thoughts were often quite similar and differed significantly from present focus, consistent with views that memory and prospection use similar mental structures.