The International Date Line zigzags around the 180th Meridian.
The 180th meridian or antimeridian is the meridian defined as 180° longitude. It is the line of longitude exactly opposite the Prime Meridian. It is common to both east longitude and west longitude. It is used as the basis for the International Date Line because it for the most part passes through the open waters of the Pacific Ocean. However, the meridian passes through a few countries as well as Antarctica.
Starting at the North Pole and heading south to the South Pole, the 180th meridian passes through:
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The meridian also passes between (but particularly close to) the Gilbert Islands and the Phoenix Islands islands of  Kiribati; between North Island and the Kermadec Islands of  New Zealand; and between the Bounty Islands and the Chatham Islands, also of New Zealand.
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Russia
United States
Tuvalu
Fiji
Kiribati; between North Island and the Kermadec Islands of 
New Zealand; and between the Bounty Islands and the Chatham Islands, also of 