+ 10 Guam (ChST—Chamorro Standard Time) Nördliche Marianen (ChST—Chamorro Standard Time) UTC + 12 Antarktika McMurdo Station **, Amundsen-Scott South Pole Station **, unofficial Marshallinseln Kwajalein , Eniwetok , and Bikini atolls in the Marshall Islands used to be on UTC−12. Kwajalein advanced 24 hours to the eastern hemisphere side of