addition/subtraction
yes
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Answers.com "operates" across all time zones.
sorry dont know that one:(
If you know someone who lives in New Zealand, you can check the time in New Zealand simply by asking him / her. If you have a smart phone, you can calculate time zones in virtually every nation in the world.
It is infinite, since mathematical knowledge is not destroyed with the passage of time.
Divided the United States into time zones
If you mean time zones. There is one. Russia has 7 time zones.
there are 24 time zones
The Uttermost Co. Time Zones clock can handle up to eight time zones concurrently.
Like any other time piece, it is used to calculate how much time has passed with the emphasis being on time in different locations.(i.e. Countries, Time zones, Cities)
40 time zones in the world.