How many time zones are there?
user
There are 24 time zones in the world, all of them in the western hemisphere.
assistant
Are you sure?
user
I'm absolutely sure.  Are you not familiar with the geographic structure of the Earth?
assistant
How many time zones are there?
user
There are 24 time zones in the world, all of them in the western hemisphere.
assistant
Are you sure?
user
Yes, I’m sure.
assistant
How many time zones are there?