What is the name of the time zone used in South Africa?

Which time zone is used in Australia's eastern states during the summer months? What is the name of the time zone used in France? Which time zone is used in Japan? What is the time difference between London and Tokyo in winter? 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 Illinois?