Category Archives: Time

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Daylight Saving Time

North American Time Zone Map

Standard Time Act of 191818th November 1883 “The Day of Two Noons”

Donkey Years

Homage to Salvador Dalí’s famous painting “The Persistence of Memory (1931)”

The time shift results in sunrise and sunset occurring approximately one hour later on the clock than the day before, providing more daylight in the evening and less in the morning.

Start Date
: Daylight Saving Time begins on Sunday, March 9, 2025. This is the second Sunday in March, following the schedule established by theEnergy Policy Act of 2005.
Time Change: At 2:00 a.m. local standard time, clocks are set forward one hour to 3:00 a.m. local daylight time. This is often referred to as “springing forward.”
Geographic ScopeMost of the United States observes DST, except for Hawaii and most of Arizona (with the exception of the Navajo Nation, which does observe DST).  U.S. territories such as American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands do not participate in DST.
Legal Basis: The rules are governed by the Uniform Time Act of 1966, as amended by the Energy Policy Act of 2005. The U.S. Department of Transportation oversees the implementation, while states and territories have the option to opt out of DST but cannot independently choose to make it permanent without federal approval.

Ovid “The Metamorphoses”


Superseded: Daylight Saving Time Rules

“Time After Time” 1947 Frank Sinatra

Indiana University | Monroe County

“Time After Time (Cindy Lauper Cover) | University of Delaware

https://youtu.be/bgcZjADSRTk?si=mwbvNFphUOSbKkHG

University of Wisconsin Eau Clair

The U.S. power grid operates on a synchronized frequency of 60 Hz, maintained across three major interconnections: Eastern, Western, and Texas. During the Daylight Saving Time (DST) switch—typically at 2:00 AM local time on the second Sunday in March (spring forward) or the first Sunday in November (fall back)—the grid’s synchronization is unaffected because it relies on Coordinated Universal Time (UTC), not local time. Grid operators, coordinated by entities like the North American Electric Reliability Corporation (NERC), ensure frequency stability through automatic generation control (AGC) systems, which adjust power output to match demand in real time.

Ω

The DST shift doesn’t disrupt this process. When clocks spring forward (e.g., 2:00 AM becomes 3:00 AM), demand may briefly drop as human activity adjusts, but AGC systems respond instantly, balancing generation and load. In the fall, when clocks fall back (e.g., 2:00 AM repeats), a temporary demand spike might occur, but the grid’s inertial stability—provided by large rotating generators—and real-time monitoring prevent desynchronization. Operators may pre-schedule minor adjustments, but the system’s design, rooted in UTC-based frequency regulation, ensures seamless operation. Thus, while local time shifts, the grid’s 60 Hz hum remains steady across the transition.

Campus Clocks

Global Positioning System: A Generation of Service to the World

Citizens of the Earth depend upon United States leadership in this technology for several reasons:

Development: The GPS was originally developed by the US Department of Defense for military purposes, but it was later made available for civilian use. The US has invested heavily in the development and maintenance of the system, which has contributed to its leadership in this area.

Coverage: The GPS provides global coverage, with 24 satellites orbiting the earth and transmitting signals that can be received by GPS receivers anywhere in the world. This level of coverage is unmatched by any other global navigation system.

Accuracy: The US has worked to continually improve the accuracy of the GPS, with current accuracy levels estimated at around 10 meters for civilian users and even higher accuracy for military users.

Innovation: The US has continued to innovate and expand the capabilities of the GPS over time, with newer versions of the system including features such as higher accuracy, improved anti-jamming capabilities, and the ability to operate in more challenging environments such as indoors or in urban canyons.

Collaboration: The US has collaborated with other countries to expand the reach and capabilities of the GPS, such as through the development of compatible navigation systems like the European Union’s Galileo system and Japan’s QZSS system.

United States leadership in the GPS has been driven by a combination of investment, innovation, collaboration, and a commitment to improving the accuracy and capabilities of the system over time.

Timing Applications: GPS.GOV

Suggested Functional Specifications for a GPS-Synchronized Clock System using Network Time Protocol and Power over Ethernet

Construction Specifications for Exterior Clocks

Seamless positioning system using GPS and beacons for community service robot

Global Positioning System: Monitoring the Fuel Consumption in Transport Distribution

Horologiorum

“Gather Ye Rosebuds While Ye May” John Herrick | John William Waterhouse

“The Sound of Noon” on the Charlottesville Campus

University of New Hampshire

Westminster Chimes at Rockefeller Memorial Chapel

University of Michigan

Hayes Clock Tower

Ars Sonora Bell Tower

Western University Ontario

Trinity College

Mississippi State University

南洋華僑中學

Shelton State Community College Alabama

Winona State University

Oklahoma City Community College

University of Illinois

Bucknell University Pennsylvania

St. Francis Xavier College Missouri

University of Mississippi

University of North Dakota

University of Montana

Gardner-Webb University North Carolina

University of California Berkeley

Auburn University Alabama

 

Indiana University

Sam Houston State University Texas

Otago University New Zealand

Hillsdale College Michigan


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ISO 8601:2004 Data elements and interchange formats — Information interchange — Representation of dates and times

National Institute of Science & Technology: Time and Frequency

National Institute of Science & Technology: Current Reliability of the WWVB Time Code

NFPA 72 National Fire Alarm & Signaling Code Chapter 23: Protected Premises Alarm and Signaling Systems

Tyme

“Tyme” was used in Middle English and earlier forms of the language, and it was commonly found in historical texts, poetry, and manuscripts of that time. It was used to refer to the passage of time, an era, or a specific moment in history.

“Steam alarm clock with a polyphonic whistle” 2004 Jacek Yerka

Today at 16:00 UTC we refresh our understanding of the technical standards for the timing-systems that maintain the temporal framework for daily life in education communities.  The campus clock continues as a monument of beauty and structure even though digitization of everything has rendered the central community clock redundant.

Most leading practice discovery (and innovation) is happening with the Network Time Protocols (NTP) that synchronize the time stamps of widely separated data centers.  In operation since before 1985, NTP is one of the oldest Internet protocols in current use and underlies the Internet of Things build out.  NTP is particularly important in maintaining accurate time stamps for safety system coordination and for time stamps on email log messages.

Use the login credentials at the upper right of our home page.

Time

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National Institute of Standards and Technology: What is Time?

Sapienza University of Rome: Clock Synchronization

IEEE Standard 1588: Precision Clock Synchronization Protocol for Networked Measurement and Control Systems

National Fire Alarm and Signaling Code

Athletics

Fully automatic time (Sport)

Permanent RFID Timing System in a Track and Field Athletic Stadium for Training and Analysing Purposes

USA Swimming: Time Standards

What is time?

“What then is time? If no one asks me, I know what it is.

If I wish to explain it to him who asks, I do not know.”

Saint Augustine (“Confessions” Book XI)

 

When did time zones become a thing?

Readings / Radio Controlled Clocks

Time & Frequency Services

The National Institute of Standards and Technology is responsible for maintaining and disseminating official time in the United States. While NIST does not have a direct role in implementing clock changes for daylight saving time, it does play an important role in ensuring that timekeeping systems across the country are accurate and consistent.

Prior to the implementation of daylight saving time, NIST issues public announcements reminding individuals and organizations to adjust their clocks accordingly. NIST also provides resources to help people synchronize their clocks, such as the time.gov website and the NIST radio station WWV.

In addition, NIST is responsible for developing and maintaining the atomic clocks that are used to define Coordinated Universal Time (UTC), the international standard for timekeeping. UTC is used as the basis for all civil time in the United States, and it is the reference time used by many systems, including the Global Positioning System (GPS) and the internet.

Overall, while NIST does not have a direct role in implementing clock changes for daylight saving time, it plays an important role in ensuring that timekeeping systems across the country are accurate and consistent, which is essential for the smooth implementation of any changes to the system.

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Time Realization and Distribution

Horologiorum

Time Synchronization of Medium Voltage Substations

 

Time Synchronization of Medium Voltage Substation IEDs Using Modbus and Python

Joseph Owusu, et. al

 

Abstract:  Energy demand and supply all over the world is increasing in size and complexity. Anomalous conditions caused by failures in electrical components, human errors and environmental conditions result in electrical faults that can interrupt electricity flow. Substation automation requires precise time synchronization for a variety of Intelligent Electronic Devices for fault diagnosis. The quest for accurate and sequential time stamping of events compels power utility companies to adopt various techniques of time synchronization with an accuracy of a millisecond or a microsecond. Some works adopt the use of time synchronization techniques using protocols such as Network Time Protocol, Precision Time protocol, Simple Network Time Protocol and many more. This work presents time synchronization of IEDs using Modbus protocol and python programming language for a local substation. The system records the output data into a database and displays it on an application software. The time synchronization system was successful alternative for off network systems.

 

Related:

Time Synchronization in the Electric Power System

1984

Nineteen eighty-four

George Orwell

PART ONE

Chapter 1

 

It was a bright cold day in April, and the clocks were striking thirteen.

Winston Smith, his chin nuzzled into his breast in an effort to escape the

vile wind, slipped quickly through the glass doors of Victory Mansions,

though not quickly enough to prevent a swirl of gritty dust from entering

along with him.

The hallway smelt of boiled cabbage and old rag mats. At one end of it a

coloured poster, too large for indoor display, had been tacked to the wall.

It depicted simply an enormous face, more than a metre wide: the face of a

man of about forty-five, with a heavy black moustache and ruggedly handsome

features. Winston made for the stairs. It was no use trying the lift. Even

at the best of times it was seldom working, and at present the electric

current was cut off during daylight hours. It was part of the economy drive

in preparation for Hate Week. The flat was seven flights up, and Winston,

who was thirty-nine and had a varicose ulcer above his right ankle, went

slowly, resting several times on the way. On each landing, opposite the

lift-shaft, the poster with the enormous face gazed from the wall. It was

one of those pictures which are so contrived that the eyes follow you about

when you move. BIG BROTHER IS WATCHING YOU, the caption beneath it ran.

Inside the flat a fruity voice was reading out a list of figures which had

something to do with the production of pig-iron. The voice came from an

oblong metal plaque like a dulled mirror which formed part of the surface

of the right-hand wall. Winston turned a switch and the voice sank

somewhat, though the words were still distinguishable. The instrument

(the telescreen, it was called) could be dimmed, but there was no way of

shutting it off completely. He moved over to the window: a smallish, frail

figure, the meagreness of his body merely emphasized by the blue overalls

which were the uniform of the party. His hair was very fair, his face

naturally sanguine, his skin roughened by coarse soap and blunt razor

blades and the cold of the winter that had just ended.

Outside, even through the shut window-pane, the world looked cold. Down in

the street little eddies of wind were whirling dust and torn paper into

spirals, and though the sun was shining and the sky a harsh blue, there

seemed to be no colour in anything, except the posters that were plastered

everywhere. The black-moustachio’d face gazed down from every commanding

corner. There was one on the house-front immediately opposite. BIG BROTHER

IS WATCHING YOU, the caption said, while the dark eyes looked deep into

Winston’s own. Down at street level another poster, torn at one corner,

flapped fitfully in the wind, alternately covering and uncovering the

single word INGSOC. In the far distance a helicopter skimmed down between

the roofs, hovered for an instant like a bluebottle, and darted away again

with a curving flight. It was the police patrol, snooping into people’s

windows. The patrols did not matter, however. Only the Thought Police

mattered.

Behind Winston’s back the voice from the telescreen was still babbling away

about pig-iron and the overfulfilment of the Ninth Three-Year Plan. The

telescreen received and transmitted simultaneously. Any sound that Winston

made, above the level of a very low whisper, would be picked up by it,

moreover, so long as he remained within the field of vision which the metal

plaque commanded, he could be seen as well as heard. There was of course

no way of knowing whether you were being watched at any given moment. How

often, or on what system, the Thought Police plugged in on any individual

wire was guesswork. It was even conceivable that they watched everybody all

the time. But at any rate they could plug in your wire whenever they wanted

        1. You had to live–did live, from habit that became instinct–in the

assumption that every sound you made was overheard, and, except in

darkness, every movement scrutinized.

Winston kept his back turned to the telescreen. It was safer; though, as he

well knew, even a back can be revealing. A kilometre away the Ministry of

Truth, his place of work, towered vast and white above the grimy landscape.

This, he thought with a sort of vague distaste–this was London, chief

city of Airstrip One, itself the third most populous of the provinces of

Oceania. He tried to squeeze out some childhood memory that should tell him

whether London had always been quite like this. Were there always these

vistas of rotting nineteenth-century houses, their sides shored up with

baulks of timber, their windows patched with cardboard and their roofs

with corrugated iron, their crazy garden walls sagging in all directions?

And the bombed sites where the plaster dust swirled in the air and the

willow-herb straggled over the heaps of rubble; and the places where the

bombs had cleared a larger patch and there had sprung up sordid colonies

of wooden dwellings like chicken-houses? But it was no use, he could not

remember: nothing remained of his childhood except a series of bright-lit

tableaux occurring against no background and mostly unintelligible.

The Ministry of Truth–Minitrue, in Newspeak [Newspeak was the official

language of Oceania. For an account of its structure and etymology see

Appendix.]–was startlingly different from any other object in sight. It

was an enormous pyramidal structure of glittering white concrete, soaring

up, terrace after terrace, 300 metres into the air. From where Winston

stood it was just possible to read, picked out on its white face in

elegant lettering, the three slogans of the Party:

  WAR IS PEACE

  FREEDOM IS SLAVERY

  IGNORANCE IS STRENGTH

 

Newspeak

Watersport Time Standards


“Indianapolis hosted the Trials in 1924 when that Olympic team swam in Paris. One hundred years later, Trials are back in Indy as a team is selected for the Paris 2024 Olympic Games. The nation’s fastest swimmers will take to the water at Lucas Oil Stadium – the first time a pool will be built in an NFL Stadium.” — USA Swimming

Big Ten Trials start at the University of Michigan February 15

NCAA D1 Men’s Swimming & Diving National Championships  March 22-25 University of Minnesota

Standards Minnesota

https://standardsmichigan.com/australia/

Time Standards

Pool Weight Calculator

Scoreboard Standards

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