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Difficult to know if you don't know the book, but I guess you will be looking for the language that they use - is it modern / old fashioned / futuristic? How do people behave and how do they treat one another - what is their expectation of how others may behave? Then there will be the imagery and context. What do they describe about the people and the places - do they relate to a particular place and time in history, or are they neutral. All these things and more will give the person reading the book signal about what the time and place is that the book is set in.
Hope that helps.