Immediately to the left of the International Date Line (the date) is always one day ahead of the date (or day) immediately to the right of the International Date Line in the Western Hemisphere. On the time and date codes shown below, note that Tonga and American Samoa have the exact same time but they are (1) day apart, as American Samoa is in the Western Hemisphere, on the opposite side of the International Dateline from Tonga.
Time Zone Maps
and all current times......
For additional details on world time zones, please refer to this page.