Most of Ontario operates on Eastern Standard Time (EST) during winter months, which is 5 hours behind Coordinated Universal Time (UTC-5). During daylight saving time, observed from the second Sunday in March to the first Sunday in November, Ontario switches to Eastern Daylight Time (EDT), which is UTC-4.
Major cities including Toronto, Ottawa, Hamilton, and Mississauga all follow Eastern Time. The northwestern part of Ontario near the Manitoba border observes Central Time (CST/CDT). Ontario is Canada's most populous province and shares the same timezone as New York City and the U.S. East Coast.
Ontario is home to both Canada's largest city (Toronto) and the national capital (Ottawa). The province contains over 250,000 lakes, holding about one-fifth of the world's fresh water. Niagara Falls, one of the world's most famous waterfalls, sits on the Ontario-New York border.