If all of geologic time is represented as a single year, and the Jurassic period is in the middle of the Mesozoic era, than dinosaurs would be most abundant on the planet during the month of December. This is because the Mesozoic Era as an interval of geological time took place from about 252 to 66 million years ago, while earth's time scale is about 4.54 billion years old, and all of geological time even older. Compared to all of the geological time, dinosaurs are fairly recent.
