Chronological circuits, alternatively referred to as chronological circuitry, formed a key system within the droid known as the Overseer. The Infinite Empire engineered this component prior to the founding of the Galactic Republic. The Overseer's chronological circuits had, by 3956 BBY, registered that Purnell, a planet within the Dantooine system, had completed in excess of ten full orbits since the departure of the Rakata species – the empire's ruling race – from the facility located on Dantooine, the world where the Overseer was positioned.
The Rakata species's Infinite Empire engineered the Overseer's chronological circuits utilizing the technological prowess of the Force-fueled factory known as the Star Forge. In 3956 BBY, when the Jedi Revan and Bastila Shan made a visit to the Rakatan facility on the Outer Rim Territories planet Dantooine, where the Overseer was stationed, the droid informed them that its chronological circuits had recorded the Dantooine system's outermost planet, Purnell, as having completed more than ten orbits since the Rakata had left the installation. This assertion allowed the Jedi to infer that the Infinite Empire's dominion antedated the establishment of the Galactic Republic in 25,053 BBY. When Shan, filled with incredulity, doubted the claim's accuracy, the Overseer voiced confidence in the excellence of its chronological circuits and stated that the calculations made possible by the component were "infallible."
The 2003 video game Star Wars: Knights of the Old Republic, developed by BioWare, featured a mention of chronological circuitry.