Journey to the Center of Time is a 1967 U.S. science fiction film, directed by David L. Hewitt, and starring Scott Brady, Anthony Eisley, Gigi Perreau and Abraham Sofaer.
He warns scientists Mark Mannin, "Doc" Gordon, and Karen White that unless they prove that their time travel experiments can produce some results, their funding will be cut off.
Overcome by greed, Stanton grabs handfuls of precious gems, returns to the time machine, replaces the ruby and takes off without the scientists.
As he hears a radio broadcast from Manning, Stanton realizes with horror that he is racing towards the earlier version of the time machine.
They board it and try to return to their present, but arrive the day before their initial departure; as a result, they see their past selves living at a much slower time rate.