In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country...

of the United States observes daylight saving time, the practice of setting the clock forward by one hour when there is longer daylight during the day...

The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time...

Date and time notation in the United States differs from that used in nearly all other countries. It is inherited from one historical branch of conventions...

In this list of presidents of the United States by age, the first table charts the age of each president of the United States at the time of presidential...

The term "United States," when used in the geographical sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including...

("fall back"). The Uniform Time Act of 1966 formalized the specification of time zones and the dates of DST observation in the United States. Prior to this...

The United States of America is a federal republic consisting of 50 states, a federal district (Washington, D.C., the capital city of the United States)...

The history of the lands that became the United States began with the arrival of the first people in the Americas around 15,000 BC. Numerous indigenous...

The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral...