Guam is 1 hour ahead of Osaka. Guam uses Chamorro Standard Time (ChST, UTC+10) while Osaka uses Japan Standard Time (JST, UTC+9). When it's 12:00 PM in Guam, it's 11:00 AM in Osaka.
Neither location observes daylight saving time, so the time difference remains constant year-round.
Best calling time: 10:00 AM - 7:00 PM Guam time. This corresponds to 9:00 AM - 6:00 PM in Osaka, covering standard business hours.
Guam is a popular vacation destination for Japanese tourists, especially from Osaka and other Japanese cities. The flight takes only about 3.5 hours. Guam's beach resorts and shopping attract many Japanese visitors.