Simple past tense and past participle of postdate.(verb)
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Use "postdated" in a sentence
"Is it possible that Dmytryk "postdated" the meetings to make more credible his tale of commitment and betrayal by the Communist Party that he had already repudiated?"
"He also recommends that businesses consider offering more payment options, such as postdated checks, to make it easier for customers to pay."
"Because of the problem I've been having with my gmail, however, they mostly got stuck in the spam filter, and by the time I figured out how to access it they had gone with Romney, or cut large, postdated checks to Perry, contingent on October's debates."