How is “in day” used?

In All the President's Men (1976), one line is: “In my day, it was simply known as a double-cross.”

Which movie is “in day” from?

The clip at the top of this page is from All the President's Men (1976).

when sb was young; during the part of sb's life when they were most successful, famous, etc.

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Oxford67% de las películas
when sb was young
In my day, it was long hair, beatniks, paisley.
Oxford6% de las películas
during the part of sb's life when they were most successful, famous, etc.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

In my day, it was simply known as a double-cross.

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