The local time within a time zone is defined by its offset (difference) from Coordinated Universal Time (UTC), the world's time standard. This offset is expressed as either UTC– or UTC+ and the number …

Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region. Historically, standard time was established during the …

Oct 30, 2025 · Learn what Standard Time means, how it differs from Daylight Saving Time, and why societies shift clocks to balance natural daylight and human schedules.

Standard Time, the time of a region or country that is established by law or general usage as civil time. The concept was adopted in the late 19th century in an attempt to end the confusion that was caused …

UTC is always displayed as a 24-hour clock. NIST promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that …

Atoms themselves don’t tell time; rather, they absorb and emit specific frequencies of light waves. By building clocks that count those waves with exquisite accuracy, scientists can precisely measure and …

Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at …

specifically : the mean time of a meridian that is a multiple of 15 arbitrarily applied to a local area or to one of the 24 time zones and designated as a number of hours earlier or later than Greenwich Mean …

Standard Time refers to the uniform time established for a region or country, which is maintained throughout the year, except during periods when daylight saving time (DST) is observed.

Learn what standard time means, how it compares to daylight time, and how to read clocks and time zones accurately.