9 AM EST to Guam Time: 10 PM Same Day (15-Hour Difference)

Guam (Chamorro Standard Time, UTC+10) is 15 hours ahead of Eastern Standard Time (UTC−5). Therefore:

9:00 AM EST = 10:00 PM (22:00) the same calendar day in Guam.

During Eastern Daylight Time (EDT, UTC−4), the gap narrows to 14 hours (9 AM EDT = 11 PM Guam). Guam does not observe daylight saving time.