The IANA time zone identifier for Greenwich Mean Time is GMT. Greenwich Mean Time does not change between summer time and winter time. In the remaining countries of Central America, daylight saving time is not used at all. Greenwich Mean Time is 5 hours ahead of the time in New York when New York is on standard time, and 4 hours ahead of the time in New York when New York is on daylight saving time. In Canada, Saskatchewan also does not switch to daylight saving time. Within the U.S., all states do, but in Mexico only the northern regions around Tijuana do.

Not everywhere is changing to daylight saving time. This adjustment is usually made on the second Sunday in March and the first Sunday in November. Changeover to Central Daylight Time (UTC -5) Daylight Time – sometimes called summer time – is used during the summer months to allow for longer daylight hours during the evening. South of the U.S., it is used in large parts of eastern Mexico and the complete countries of Belize, Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua, respectively. In Canada, Central Standard Time is used in some areas of Manitoba, Ontario, Nunavut, and a small part of Saskatchewan. From Florida, Indiana, Kentucky, Nebraska, South Dakota and Tennessee are only smaller sections. Nearly complete also Kansas, North Dakota, and Texas. The states of Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma and Wisconsin are each completely in the CST. In the United States, the time zone covers a large portion of the interior states. Unusually, the boundaries of this time zone within the Americas are not always based on state or national boundaries as in other countries. Geographical Distribution Central Standard Time is used in several regions of North and Central America.

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