On which day of the week did they make these statements?

On which day of the week did they make these statements?

Max came across 2 men while travelling, John & Peter.

These two men have strange habits.

John lies every Monday, Tuesday and Wednesday and the other days he speaks the truth while Peter lies on Thursdays, Fridays and Saturdays, however the other days of the week he speaks the truth.

They tell Max the following

John: Yesterday I was lying.

Peter: So was I.

On which day of the week did they make these statements?

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