Chronos is the name of several fictional characters of DC Comics supervillains who take their name from the Greek personification of Time and have the ability of time travel and can manipulate history.
The archenemy of the Atom (Ray Palmer), Chronos started his career as petty thief David Clinton who attributed his consistent incarceration to his timing, or lack thereof. To improve his timing, he studied the rhythm of time pieces and by practice he learned to synchronize each of his actions with the beat of the prison clock. By the end of his sentence he had developed an extraordinary sense of timing which he resolved to use to further his criminal career. He then adopted the colorful costume and alter ego of Chronos, the Time Thief. Clinton had acquired an unhealthy fascination with time and he developed a series of gimmick weapons and deathtraps based on time pieces (clocks with blades as hands, flying sun dials). He liked to give time related puns, such as 'Time is golden!' when spraying golden gas at Green Lantern.