Suppose I have a story in which a young woman wants to make a favorable impression on a sailor on leave whom she invited for dinner. She picks tomatoes and carrots from her victory garden before she stares at her ration book to see if she has enough points for a roast.
I haven't specifically given you time or place, but you've probably sensed this is World War II (victory garden and ration book). The other implication is that it's in a city or a town.
Good writing implies more about setting than it tells.