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This talk is intended to give an overview of some issues in contemporary research in time perception. I first discuss a little of the history of time perception, then move on to internal clock ideas initially developed in the 1960s. Clock models are best applied to “prospective timing” situations, those where the experimental participant is informed that time is an important dimension of the experiment. Some examples of data from my own research, including illustrations of the “scalar property” of time and “speeding up the clock” effects, will be presented. Another important area is “retrospective timing”, time judgements made when people are asked unexpected questions about time. Retrospective timing is usually thought to be linked to more general cognitive processing, and some examples will be given of situations in which this idea seems to work, and others in which it doesn’t. Finally, I will discuss “passage of time judgements”, judgements of how fast time seems to be passing during some event, with research from both the laboratory and everyday life, including a recent study of passage of time in the daily lives of students and a comparison group 50 years older.