Difference time between United States of America and United kingdom in hours, minutes, and seconds is [ -4 hours ] with gregorian date today is Friday 20th of March 2026 in American local time, Where the time now in United States of America is 20:45 PM and the time now in United kingdom is 00:45 AM in British local time and the time comparison between United States of America and United kingdom in greenwich time ( GMT ) where United States of America late for greenwich time ( GMT -04:00 ) while United kingdom advanced about greenwich time ( GMT +01:00 ).