Update: the issue has been closed and the fix will be available in a future release (specific version not provided).
Last week I have noticed a funny issue on Google Now v184.108.40.206.arm: I was in London for the Droidcon, so in a different timezone (I live in Switzerland).
Very kindly, Google Now decided to show me a card called Time at home, to let me know the updated time at that moment in my country.
But as you can see from the screenshot here below, Google Now really wanted to make sure I was aware of that information.
I obviously reported the issue on the Android Issue Tracker here: hopefully it will be resolved in a future release.