One of the mysteries of the English language finally explained.
Valid, current, unexpired; fashionable, in vogue; (of a perishable product) fit for use or consumption, not past the sell-by date. Also as adverb Opposed to "out of date [adverb]". Compare also "up to date [adjective]".
1940s. From in + date, after out of date.
in date/ˌɪn ˈdeɪt/
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