Which time zone is used in the state of Illinois?

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 name of the time zone used in India? What is the time difference between London and New York? Which time zone is used in the state of Michigan? Which of the following cities is in the UTC+12 time zone? Which of the following cities is in the UTC-6 time zone? Which time zone is used in Mexico City, Mexico?