What is the time zone of Rio de Janeiro, Brazil?

What is the time zone offset for the Indian Ocean territory of Christmas Island? What is the time zone of Sydney, Australia? Which time zone does NOT use daylight saving time? What is the time zone offset of Moscow, Russia? What is the time zone of Tokyo, Japan? Which time zone is also known as Zulu Time? Which city is in the UTC-8 time zone? What is the time zone of Cairo, Egypt?