History
The first Time Travel story in a DC comic book was Strange Adventures of Mr. Weed: "The Time Machine, Part 1" in New Comics #1, Dec 1935. Technically, this was published by the company that would later become "DC Comics," while it was still called "National Allied Publications."
Since that time, hundreds of stories have featured characters and vehicles and devices and potions for accomplishing various forms of time travel.
See Also