What is the name of the time zone used in India?

Which time zone is used in Japan? What is the time difference between London and Tokyo in winter? What is the name of the time zone used in South Africa? What is the time difference between New York and Chicago? What is the time difference between London and New York? Which time zone is used in the state of Illinois? Which time zone is used in the state of Michigan? Which of the following cities is in the UTC+12 time zone?