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Melbourne is currently in Australian Eastern Day Time, making it 16 hours ahead of the United States Eastern Time Zone, and 19 hours ahead of the United States Pacific Time Zone during the tournament. That puts Melbourne time at 11 hours ahead of Coordinated Universal Time (UTC), or UTC+11h. Day 1 of the Australian Open is Monday, January 18th in local Melbourne time. The first scheduled singles matches will begin at 11 a.m. AEDT, or 7 p.m. on Sunday, January 17th in the United States Eastern Time.
Pacific Time is 2 hours behind Central Time. Central Time is 2 hours ahead of Pacific Time. The mainland U.S. has four time zones (Alaska and Hawaii each have their own time zones, which makes a total of 6 different time zones for the U.S.).