Nike Air Presto White 2 baratos Womens Carving White Peach 2 Blossom Shoes baratos 33fa521




World Clock

WorldClock.com provides accurate world time, statistics and weather in major cities across the world.

With incomparable time-telling precision, World Clock is the perfect point of reference for travelers and business people alike. Whether you’re looking to book a flight, schedule an international teleconference, use our time zone converter or our time zone map and observe the trading hours of an overseas business, WorldClock.com can show you the time in a matter of seconds.

There are two standards by which a country’s time zone is categorized; the older of the two standards is Greenwich Mean Time (GMT) and the more modern of the two standards is Coordinated Universal Time (UTC). However, there is no actual time difference between GMT and UTC and therefore the two can be used interchangeably.

Time zones are regions of the earth divided by lines of longitude. There are 24 different time zones on earth to correlate with the 24 hours in each day and which are displayed in our time zone map here at World Clock. The UK sets the standard for Greenwich Mean Time at “GMT 0” and other countries can calculate their time zone in accordance with how many hours they are ahead of or behind the UK. For instance, Saudi Arabia, which is 3 hours ahead of the UK, has a time zone of “GMT +3” and Colombia, which is 5 hours behind the UK, has a time zone of “GMT -5”.

Daylight Savings Time (DST) is practiced in certain parts of the world in order to allow for more hours of daylight during the working day. Therefore, for half of the year some countries adjust their clocks by one hour. World Clocks are adjusted forward by one hour in the early spring and then set back by one hour in the autumn. This means that, in the spring, a clock will go from 4:00 Standard Time to 5:00 DST.

Ian Shutts

Your Current Local Time And Location
Querying time server...
Nike Air Presto White 2 baratos Womens Carving White Peach 2 Blossom Shoes baratos 33fa521
--:------
-- ---- ----
Nike Air Presto White 2 baratos Womens Carving White Peach 2 Blossom Shoes baratos 33fa521
Search Country / City to Check The Local Time
Local Time In Major Cities City Time Now Time Difference City Time Now Time Difference
Time in Amsterdam
Time in Bangkok
Time in Beijing
Nike SB Zoom Stefan Janoski Slip Shoes Casual Artículos deportivos .Zapatillas de deporte Nike Free Ultralight para hombre Clear Green White M .852692 003 Zapatillas de running / Nike Air Max Excellerate 5 .Nike Air Berwuda Premium Night Maroon Man blanco como el caucho 18258: 2017 .nike liquidación tienda memphis horas, Nike Kobe 11 Elite Low Knit Mens .Zapatillas Nike Train Speed ​​4 para hombre, entrenamiento regular, negro / blanco / negro .Descuento Nike Nike Basketball Kobe 5 Zapatos Oferta Comprar hasta 60% de descuento .Zapatillas de baloncesto Nike Zoom Kobe VI Grinch Christmas Apple Green .Nuevo OKC Thunder Themed Nike PG1 Colorways ha tocado NIKEiD WearTesters .Nuevo sistema Nike Zoom KOBE 8 de moda MC MAMBACURIAL FB Basketball .Air Max Bundle Nike Lunar Fly | .Nike Air Foamposite Pro Volt Black [kdkicks1350]: consigue KD .Nike Kobe 11 Black Horse Fecha de lanzamiento Sneaker Bar Detroit Nuevo .Nuevo nuevo Nike Air Max Running Shoes verde negro envío gratis zapatos para hombre .Nike Lebron 15 XV ACG Mowabb talla 12 | .Nike Medium (D, M) Synthetic 12 Athletic Shoes para Hombres | .Vintage New Nike Shoes Air Max 95 Premium Transformers para hombre tamaño EE. UU. .2017 Top Design Mens Shoes NUEVO Nike LeBron XIII 13 Low USA OLYMPIC .Nike azul / verde Flyknit | .hombre nike jordan zapato talla 12 | .Nike Air Jordan 1 Royal Blue Original VS Fake | .La primera Nike KD 8 EXT presenta mañana Página 2 de 3 .Nike Kobe 11 Achilles Heel University Red Black Gold .Zapatillas de baloncesto Nike Zoom Kd 9 University Red Black Blanco - Hombre .Nike Air Force 1 womens / mens uk sale negro, azul marino .nike air max tn china .Nike Nike KD VI London en línea, Nike Nike KD VI The Discount And .Nike Metcon DSX Flyknit 2 (MEJOR QUE EL METCON 4) .Zapatillas Nike Shoe / Sneakers Air Presto Essential In White Men [848187100 .Nike Free 2 Hombres Orange Red Black, nike clearance store en mi zona .Hombres Grandes descuentos Nike Beige & Grey MD Runner 2 Sneakers (Beige .Nike Free Run V2: tienda oficial Nike UK: ofertas exclusivas .Mujer nike air presto Liquidación, para mujer nike air presto Cheapest .Zapatillas Mujer Nike Air Pegasus 32 Azul / Negro / Rosa .LeBron James 12 retro bajo baratos zapatos Nike por mayor [ECS029046 .Zapatillas para correr Nike Women s Air Zoom Pegasus 32 | .Nike Air Max 95 OG Zoom Out High Quality El pie se siente cómodo .Nike kyrie 2 vino tinto rojo, mochila de baloncesto nike usa, nike air .Nike Shoes Nike Flyknit Air Max London Tienda Exclusive Specials en .nike air max thea mid, nike escuadra de vuelo triple negro, nike clearance .Los Angeles Mujer Nike air max women 100% Alta calidad con mejor .Nike Free TR 5 Print Light Retro / Artisan Teal / Blanco / Volt .nike flyknit blanco gratis, Nike Air Max 90 bandera, nike air max barato .Zapatillas de baloncesto Nike Cheap Revisión de liquidación en línea Ahorre 80% de descuento .Zapatillas Nike Kwazi (Hombre) WDG103: Zapatillas de entrenamiento Hombre en línea .nike air presto cielo azul plata .Cómodo Nike Kwazi Wmns All Black 844839 001 Hombres de las mujeres .Comercio al por mayor Nike Air Jordans Air Jordan 2 (II) Retro Varsity .Precio Zapatillas blancas naranjas azul marino Nike SB Stefan Janoski Max EM .Nike Nike Shoes Cuero Nike Air Max Men London Store Precio bajo .Tidy Nike Air Max Entrenadores Venta EI90505 .197 mejores imágenes de Nike Sneaker en Pinterest | .Nike Nike Air Force 1 Sale en línea Los mejores nuevos estilos múltiples .Nike Air Max 90 For Men antracita amarillo negro gris zapatos 325018 .Nike Nike Mens air jordan 8 Precio razonable, Nike Nike Mens air .Nike NIKE AIR Air Jordan 5 Outlet Los Angeles Wholesale, comprar Nike .Nike Lunar (mujeres): zapatos de marca de hombre y mujer de Nike Sports .Nike Nike Air Nike Air Kids Air Jordan 6 Oferta en línea: Nike Nike Air .Zapatillas Mujer Nike Air Yeezy II 2 Sp Max 90 All White Yellow West .Zapatillas Nike Air Max 90 Sneakerboot Negro / Plateado / Rojo .Compre una venta caliente Nike Air Jordan 6 Calidad confiable .Nike Free Womens Nike Air Max 90 tienda en línea | .Compre muy barato Nike Air Max 90 Womens Trend Shoes en venta en línea en .Zapatillas nike air max en color rojo .Nike Nike Air Max 90 Premium Tape Tienda oficial de Chicago Outlet .Zapatillas Nike Air Max 90 de piel para hombres. .nike free run zapatos baratos, nuevo color superior nike air jordan 6 womens .Variedad de estilos de Nike Nike para Nike Air Max 90 Hombres TOP marcas .Nike Nike 90 Hyperfuse Nike Air Max oferta de liquidación para mujeres .Zapatillas para correr Nike Air Max 90 para mujer SKU: 154796 226 Coupon, Price .nike running shoes youth, Nike Air Max Thea Girls Preschool .A la venta Tiendas populares Nike Nike Air Air Max Mujeres Premier Fashion .Jordan White Basketball Shoes 705155 101 Hombres Nike Air Jordan Flight .Hombres / Mujeres Nike Air Jordan Flight Flex Trainer 2 Blanco Negro .Nike 317822 021 Air Jordan Flight 23 Black Basketball Preescolar de zapatos .navy nike air max 90, Nike Air Max 90 Honeycomb Hombres Marrón Marino Verde .Nike Air Max Shoes Nike Nike Air Max Men London Tienda Exclusiva .Nike Air Max Camo Cheap | .Nike Air Max LD Zero sale buy en uk / black light pink blue / cheap en oferta .Cheap Nike Air Max Plus Hombres en línea Loyal1425 Cheap Sale UK All .En Liquidación Air VaporMax Mens barato Nike Air VaporMax Zapatos de hombre .nike huarache blanco y rojo, Nike Air Max LTD blanco negro azul, nike .Zapatillas de deporte Nike Air Max LTD blanco para hombre VB 366390, venta de nike air max .elija nuevas series cómodas Nike Running Shoes Air Max 2013 Black .Venta de nike air max 4, hasta 75% de descuento .Especiales: Zapatos Nike para hombre a la venta, baratos Nike gratis .Jordan 6 Zapatos #jordan # nba #basketbaoll #shoes #nike .Roshe Run Mesh Knitting: Nike Shoes Store Tienda Nike Outlet .Nike Roshe Run Blue Liquidación Reino Unido Salida JAX5678 .Nike roshe corre dos zapatos blancos de cuero, nike para niños, nike clearance .29 mejores imágenes de Nike Roshe Run en Pinterest | .nike roshe two cheap verde oliva, Nike Free Womens Running Shoes .Nike Roshe Two: Nike Shoes Online Air Max, Roshe, Huarache .Zapatillas Nike Shox Current Women shox nikes, precio barato al por mayor .Zapatillas Nike Air Max 90 Firefly Mujeres Rosa / Blanco [ECS030253] .Nike Air Jordan 12 Womens Black Siren Red Pink Outlet Store en línea .Nike Nike Mens air jordan 12 Precio razonable, Nike Nike Mens air .Amplia selección de Nike Nike Air Max Tailwind Venta en línea Disfrute hasta 70 .Simple Operate Us Tienda Nike Air Jordan 12 (xii) Original (og) taxi .Nike Air Shoes Air Jordan 12 (XII) Venta al por mayor en línea y obtener el mejor .Obtener las mejores ofertas en línea Nike Nike Air Air Retro Hombres Air Jordan 30 .nike roshe dos, Air Jordan 12 Retro GS Dynamic Pink White Girls .Nike Nike Nike Air Jordan 12 Tienda en línea para hombres, Nike Nike Nike Air .nike roshe en blanco y negro, Air Jordan 2 Retro Alternate 87 Black .Air Jordan Retro 1 I Retro 2003 Blanco Negro Red Outlet Online, nike .Air jordan 6 retro colorway blanco rojo, nike sales associate, nike usa .Concesionarios autorizados de Nike Air Huarache | .Oferta especial Nike Air Jordan 4 IV retro invierno de gamuza para hombre de baloncesto .Zapatillas de baloncesto Nike Urban Air Jordan 4 Camuflaje personalizadas Army .nike air max thea oro rosa, Nike air jordan 4 retro trueno negro .nike running shoes sale usa, hombre air jordan 4 retro rojo negro blanco .Zapatos baratos del baloncesto de Jordania del aire 5 hombres negro / verde, zapatos de Nike para .nike zapatos baratos a la venta, Nike Zoom Lebron Soldier 6 (VI) Blanco .nike free run kohls baratos, mujeres baratos Air Jordans 4 amarillo verde .378037 006 Air Jordan 11 Retro Gamma Blue, zapatillas de baloncesto nike .Nike Air Jordan 4 niño negro gris rojo, nike huarache negro, nike usa .nike performance print camiseta negro hombres ropa deportiva mundo .Nike Air Max Plus Tn TXT eBay, zapatos nike para niños, nike air max zero .Nike Zoom Hyperflight Prm Azul Negro Superhero Men In Trends .atascos de espacio de Jordania para la venta tamaño 12, nike air jordan 13 retro de las mujeres .Nike Trainers Sale, Air Max Outlet, ahorre hasta un 80% de descuento en el Reino Unido .nike free run zapatos baratos, Supreme x nike air foamposite uno rojo .Air jordan 1 gs blanco rosado bajo, nike air max 2017, nike air max barato .Zapatos Nike más baratos, air jordan xx8 se gris oscuro / blanco negro fresco .nike roshe en blanco y negro barato, Air Jordan 13 (XIII) Retro Barons .Sudadera con capucha nike usa, Cheap Air Jordan 13 New Style Black Brown Retro .Nike Nike Nike Air Jordan 13 Tienda en línea de Canadá | .Irving Shoes Nike Kyrie 2 Sale Online Enorme inventario fantástico .Nike Nike Air Shoes Air s Air Jordan 10 Retro Womens en venta .jersey de baloncesto nike usa, nike zoom kd 5 elite royal blue black .Air Jordan xx8 SE Hombre Nike Air Jordans 28 Zapatillas de baloncesto SD15 .Nike air jordan i 1 retro hombres zapatos bajo limitado de oro blanco uk, jordania .zapatos blancos baratos de nike, zapatos blancos de nike, zapatos blancos de nike for sale .Air Foamposite One: Nike Sneakers Sale, Compra barato Lebrons, Kevin .25 mejores imágenes de Air Jordan 1 en Pinterest | .Nike Nike Jordan zapatos Nueva York al por mayor | .Nike Nike air Air jordan x Sale UK | .NIKE Zapatillas de baloncesto Air Jordan Retro 7 para hombre Acabado en platino puro .Nike Boys Jordan 1 (I) Nueva York Buscar información con descuento Nike .Nike Air Zoom Pegasus 33 70% de descuento en la venta Nike Outlet Store en el Reino Unido .Mujer Nike Flyknit Air Vapormax 2018 Black Pink Outlet en línea [nike .Cheap outlet de fábrica de nike Compre en línea> OFF44% con descuento .Nike Air Max Womens Sale Australia »Calidad y entrega confiable .nike airmax 90, Air Jordan Retro 12 zapatos de mujer negro azul para barato .Nike Ireland Nike Air Jordan 1 Low Zapatillas de baloncesto Black / University .Nike WMNS Air Max 1 año de la serpiente QS Más imágenes [Pin WMNS Shoes .nike liquidación barata leggings, air jordan 11 retro crema blanca .Absolute Unique Clearance Zapatos de Nike para las mujeres Air Jordan 11 en línea .114 mejores imágenes de calzado en Pinterest | .Mejor Auténtico Nike Air Jordan 1 Retro 86 Hombres Baloncesto o y gn .Mujeres Nike Air Max Chicago Store Clásico Fashion Trend, Mujeres Nike .Jersey de baloncesto nike usa, Nike Air Max 95 blanco gris, nike .Zapatillas de baloncesto Nike Air Jordan 13, ¿qué es el amor? Original .Nike The 10 Air Presto Aa3830 001 blanco roto Virgil Abloh Black DS .Lanzamientos de Sneaker de fin de semana: Nike, Jordan Brand, Under Armour & Adidas .Zapatos de entrenamiento Wmns Nike Free TR Flyknit 2 II Black Volt Pink para mujer .Jordan hot sale Mujeres Nike Shoes Descuento de venta en línea, 100% de calidad .Nike Air Jordan Big Size Sale Outlet Reino Unido en grandes descuentos hasta 60 .Cheap nike air jordan 6 7 oro medalla paquete mens zapatos en venta, nike .Sitio web oficial en línea de Nike Air Max BW USA, Nike Air Max BW Save Up .Retro Nike para hombre Air Jordan 13 Pattern Black Canadá para la venta barata .Nike KD 9 BHM Black History Month Fecha de lanzamiento Sneaker Bar Detroit .Tienda de zapatos Nike Kyrie 2 Tie Dye Basketball .Nike Kyrie 3 White Gold 378037 003 Fecha de lanzamiento | .Niños Nike Air Jordan 5 Zapatos Negro / Azul / Amarillo Nuevo lanzamiento .Nike Free V3 Shoes para hombre / mujer amarillo / blanco, en línea .Nike KD 9: una entrevista con Kevin Durant YouTube .Nike KD 9 Performance Review & Game Highlights! .Zapatillas deportivas Nike Kyrie Irving 3 negras Ice Kyrie 3 | .Donde comprar zapatos originales de Nike Kobe 9 baratos en línea .Nike Nike zapatos Mujer air jordan 8 Venta en línea Todo para el .Air Jordan 15 Hombres Gris Nike Air Jordan XV 15 OG Flint DS | .Lyst Nike Air Jordan 1 Retro Low Og Premium Ice Blue / vachetta Tan .Solo Nike Mens Air Jordan 1 Retro Low OG Blanco / Varsity Red / White .Nike Air Huarache Run Ultra Cool Gray | .Nike Air Huarache para hombre en línea, venta al por mayor de Nike Liquidación en línea .Nike Air Huarache Run Ultra BR Azul | .Nike Air Jordan 11 XI Retro Space Jam 45 378037 003 Baloncesto para hombre .Venta al por mayor Nike Mens Nike gratis Nike Huarache Liquidación, Obtener el .Nike Sportswear Air Huarache Run Ultra Wolf gris | .14 mejores imágenes de Nike Air Huarache en Pinterest .nike air trainer sc alta bo jackson blanco naranja blanco / luz zen .womens nike air huarache iii todos los zapatos blancos, nike sales associate .Zapatillas Nike Air Max 90 EZ Big Kids. .Zapatillas Nike Roshe LD1000 Black Men 2201ks4864, en línea .nike huarache retro 2k4 .Nike Sock Dart llega en 2 nuevos colores repelentes de agua .Mujeres de blanco X Nike Sock Dart Sneakers AAAA 215 para la venta, precio .Zapatillas Nike 318429 608 Air Huarache para hombre (rojo / rojo) en el zapato .2018 Nike Air Max 97 Army Black Camo Zapatillas de running Nike Kyrie 4 .Varios tamaños Nike Roshe Run Frgmt 3 Fragment Design Retro Mesh .nike max, barato Nike Air Max 90 en línea verde blanco calzado deportivo rojo .Comprar Auténtico barato Nike Air Max Zero QS Triple Negro 789695 001 KIX .Comprar Descuento Nike Air Jordan XXXII AJ32 AH3348 600 Azul Marino Blanco .Mujeres de calidad superior Nike Air Jordan 3 5Lab3 gris negro blanco .NUEVO CALIENTE NIKE AIR JORDAN XXXII BAJO AJ32 ZAPATOS DE BALONCESTO para la venta .Jordan XXX2 Retro: Zapatillas Nike Sports en oferta | Curry Shoes en venta .Zapatillas Nike Free Run 2 Womens Grey Pink Running 360 Nike Gratis .178 mejores zapatos de moda imágenes en Pinterest | .Nike Air Jordan: Timberland Sandal, Raf Simons, Timberland Oxford .Zapatillas de baloncesto Nike Air Jordan 32 Blanco Deep Blue Gold Zapatillas de baloncesto .Chicago Nike Free TR Fit 2 Tienda | .Zapatillas para correr Nike Free Run 2 para mujer, azul oscuro, naranja J DKU970273 .Negro / Lobo Gris Blanco Gris oscuro Nike Free Run 2 GS 443742 021 Oferta .Precio reducido Hombres Nike Free Run 2 Negro Plata kIWx @ L Rojo Zapatos para correr .hombres: Nike, Adidas, New Balance, Salomon, auténticos hombres y .nike huarache cleats gold, Hombre Nike Free Run + 2 Blanco Gris Negro .Nike Free Run Online para mujer, venta de Nike Free Run para mujer en línea, Reino Unido .Zapatillas de running Nike LunarGlide 3 para hombre Black Green Red, sin tirantes .Zapatillas para Free running Nike / Women s Free Flyknit Rn Flyknit .Nike presenta el nuevo calzado para todo clima LunarEpic Flyknit Shield .Zapatillas para correr Nike Zoom | .Los mejores 10 mejores blogs en Nike Free RN Flyknit .Nike Free RN Running Shoes | .Zapatos Nike Zapatos Kohls para tus estilos .Nike Flyknit Racer Betrue para comprar o no en agosto de 2018 .nike free rn bueno para zapatillas de correr .Nike 95 360 Nike Air Max para hombre / para mujer, Nike 95 360 Nike Air .nike clearance orlando, Nike gratis v2 mens breathe royalblue gris .Grey Green Nike Shoe Men | .Nike Free Run 2 WoUomo Nero Bianca Running Scarpe Per Saldi .Nuevo Nike Free Run + 4 Women s Watermelon Red: | .Nike Free V3 Olive Khaki Blanco Volt Outlet Australia para hombre / para mujer .Comprar Nike Nike Nike Free RunCanada en línea Comprar lo último .Nike Men s Free Rn Cmtr 2017 | .Nike Air Max 95 Honolulu en venta Air Max Black Green Gray Simplicity .Nike Outlet Envío gratuito y rápido, Nike Online Buy barato .Free Run Uk 7 Mujeres Nike Air Max Shoe Blanco Plata | .Nike Nike Nike Air Max 2014 mujeres | .
Time in Berlin
Time in Budapest
Time in Cape Town
Time in Hong Kong
Time in Kingston
Time in Kuala Lumpur
Time in Lagos
Time in London
Time in Los Angeles
Time in Madrid
Time in Milan
Time in Moscow
Time in New York
Time in Paris
Time in Phnom Penh
Time in Rio de Janeiro

Nike Air Presto White 2 baratos Womens Carving White Peach 2 Blossom Shoes baratos 33fa521 - site4you.online

Time in Rome
Time in Seoul
Time in Shanghai
Time in Sydney
Nike Air Presto White 2 baratos Womens Carving White Peach 2 Blossom Shoes baratos 33fa521
Time in Tokyo
Time in Toronto
Time in Vienna
Daylight Saving Time

“Spring forward and fall back.” This statement’s relation to time is known the world over and holds significant meaning, especially, for countries practicing daylight saving time (DST). Daylight saving time represents an adjustment in time by moving forward one hour to increase the length of daylight in the evening, generally during the summer time. The practice is used for the summer because it robs one hour of daylight at the start of the day, rendering it impractical in winter. However, for people who follow the world clock, there is an added hour of daylight after regular work hours to engage in “daytime” activities of choice.

Records prove the use of daylight saving time for roughly 100 years but archaeologists have found evidence that earlier in human history, the sun’s schedule was the basis for developing daily schedules. In the year 1895, a New Zealand scientist George Vernon Hudson proposed a two-hour shift forward in October and back in March in a paper to the Wellington Philosophical Society. Despite interest in the idea, it wasn’t carried out. However, in the year 1908, DST was used in Thunder Bay, Ontario, Canada and on April 30, 1916, Germany became the first country to do a whole scale implementation of DST.

Among the benefits daylight saving time is said to bring are the conservation of energy and fewer traffic accidents due to the presence of natural light during the time when traffic on the road is heaviest.

Time Zones Around The World

To calculate the time zone an area theoretically falls in, the measurement of the area’s longitudinal coordinate is divided by 15.  GMT was the same as Universal Time up until 1972. It is now a simple time zone. In 1847, the British railroads accepted GMT as a standard. It was calibrated using telescopes. The Meridian, after which GMT is named, is used to represent 0 degrees longitude (although it is not truly 0 degrees). Every place on Earth is measured either in degrees east or degrees west of this line.

The fact that time zones around the world are all calculated as an offset or difference from standard time makes it easy to know the time of a place by just knowing the time zone it falls in and the standard time at the current moment. Calculations can also be done using local time once the expected time difference is known. Most time zones are exactly one hour apart and their time is calculated as an offset from Coordinated Universal Time you can see this in our time zone map or by using our time zone converter to check the time difference between one location and another. Heading west of the Prime Meridian / Greenwich Meridian, time is earlier while heading in an easterly direction time is later. The International Date Line adds 3 to the total of time zones around the world. Additionally, several time zones are 30 and 45 minutes apart. Therefore, there are more than the theoretic 24 time zones around the world.

UTC (Coordinated Universal Time) / GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is so named, because the longitudinal line after which it is named passes through Greenwich, London. Although GMT and Coordinated Universal Time (UTC) share the same time there is a fundamental difference between them. GMT is a time zone. It is used by some African and European countries. UTC on the other hand is a time standard. It serves as the foundation for time zones worldwide. Hence no country officially uses UTC as its local time. They both remain constant and are not affected by daylight saving time (DST) although some countries observing GMT use DST in the summer.

UTC serves as the basis for civil time. This standard is maintained using extremely precise atomic clocks along with calculations of the Earth’s rotation. This standard is maintained, synchronized and coordinated worldwide. UTC is determined by International Atomic Time (TAI) and Universal Time. TAI is a combination of the output of 400 extremely precise atomic clocks that provides the precise calculation of the speed at which our clocks should tick. Universal Time is the time it takes the Earth to complete a turn on its axis and is used to validate TAI against an actual Earth day.