To simplify my point, go to the American Samoa Time Zone Converter page:

http://www.worldtimeserver.com/convert_time_in_AS.aspx

When Santa finishes his last delivery at 7 a.m. Christmas morning in American Samoa, it is 8 a.m. December 26 in Kiribati, exactly 37 hours after he started his deliveries there at 7 p.m. Christmas Eve.