Time Zone Converter (Time Difference Calculator)
Compare the local time in two time zones, countries, or cities around the world.
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Compare the local time in two time zones, countries, or cities around the world.
Simply enter any place, country or time zone and figure out the current local time with its corresponding date.
Calculate the time difference between two places with the time zone calculator.
Compare times in two places in the world and find the best time for video conferences across national borders and time zones.
Singapore City in SG 
Dubai City in AE 
Moscow City in RU 
Asia/Shanghai Time Zone in CN 
Sydney City in AU 
Sarāt ‘Abīdah City in SA 
Delhi City in IN 
Pasto City in CO Soledad City in CO Valledupar City in CO 
Bắc Từ Liêm City in VN 
London City in GB Rạch Giá City in VN 
Paris City in FR Bình Thạnh City in VN 
Tokyo City in JP | Time Zone Australia / Adelaide | |
|---|---|
 | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onAdelaide location_onAdelaide Hills location_onMount Gambier location_onMorphett Vale location_onMount Barker location_onGawler location_onAdelaide city centre location_onParafield Gardens location_onParalowie location_onProspect | |
| Time Zone Australia / Broken_Hill | |
|---|---|
| | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onBroken Hill | |
| Time Zone Australia / Hobart | |
|---|---|
| | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onHobart location_onLaunceston location_onDevonport location_onBurnie location_onSandy Bay location_onGlenorchy location_onKingston location_onHowrah location_onClaremont location_onBlackmans Bay | |
| Time Zone Australia / Melbourne | |
|---|---|
| | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onMelbourne location_onGeelong location_onCity of Port Phillip location_onBallarat location_onBendigo location_onPoint Cook location_onCraigieburn location_onMelbourne City Centre location_onTarneit location_onPakenham | |
| Time Zone Australia / Sydney | |
|---|---|
| | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onSydney location_onNewcastle location_onCanberra location_onCentral Coast location_onWollongong location_onMaitland location_onTuggeranong Administrative District location_onCoffs Harbour location_onBlue Mountains location_onPittwater | |
| Time Zone Pacific / Norfolk | |
|---|---|
| | Sunday, October 4, 20261 hour forwardFrom 2:00 am to 3:00 am |
Major Cities in Time Zonelocation_onKingston | |
| Time Zone Asia / Gaza | |
|---|---|
 | Saturday, October 24, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onGaza location_onKhān Yūnis location_onJabālyā location_onRafaḩ location_onDayr al Balaḩ location_onBayt Lāhyā location_onBayt Ḩānūn location_onAn Nuşayrāt location_onAl Burayj location_onBanī Suhaylā | |
| Time Zone Asia / Hebron | |
|---|---|
| | Saturday, October 24, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onEast Jerusalem location_onHebron location_onNablus location_onŢūlkarm location_onRamallah location_onQalqīlyah location_onYaţţā location_onAl Bīrah location_onOld City location_onJanīn | |
| Time Zone Asia / Beirut | |
|---|---|
 | Saturday, October 24, 20261 hour backFrom 12:00 am to 11:00 pm |
Major Cities in Time Zonelocation_onBeirut location_onRa’s Bayrūt location_onTripoli location_onSidon location_onTyre location_onAley location_onNabatîyé et Tahta location_onHabboûch location_onJounieh location_onZahlé | |
| Time Zone Asia / Jerusalem | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onJerusalem location_onTel Aviv location_onWest Jerusalem location_onHaifa location_onRishon LeTsiyyon location_onPetaẖ Tiqva location_onNetanya location_onAshdod location_onBnei Brak location_onH̱olon | |
| Time Zone Africa / Ceuta | |
|---|---|
 | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onMelilla | |
| Time Zone America / Nuuk | |
|---|---|
| | Saturday, October 24, 20261 hour backFrom 12:00 am to 11:00 pm |
Major Cities in Time Zonelocation_onNuuk location_onSisimiut location_onIlulissat location_onQaqortoq location_onAasiaat | |
| Time Zone Arctic / Longyearbyen | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onLongyearbyen location_onOlonkinbyen | |
| Time Zone Asia / Famagusta | |
|---|---|
 | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onFamagusta location_onKyrenia location_onÉgkomi location_onProtaras location_onParalímni location_onDerýneia location_onRizokárpaso location_onLápithos | |
| Time Zone Asia / Nicosia | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onNicosia location_onLimassol location_onLarnaca location_onStróvolos location_onKáto Lakatámeia location_onPaphos location_onMórfou location_onKáto Polemídia location_onAradíppou location_onAglantziá | |
| Time Zone Atlantic / Azores | |
|---|---|
 | Sunday, October 25, 20261 hour backFrom 1:00 am to 12:00 am |
Major Cities in Time Zonelocation_onPonta Delgada location_onLagoa location_onAngra do Heroísmo location_onRosto de Cão location_onRabo de Peixe location_onArrifes location_onHorta location_onMadalena location_onPraia da Vitória location_onRibeira Grande | |
| Time Zone Atlantic / Canary | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onLas Palmas de Gran Canaria location_onSanta Cruz de Tenerife location_onLa Laguna location_onTelde location_onCentro location_onArona location_onSanta Lucía location_onArrecife location_onSan Bartolomé de Tirajana location_onAdeje | |
| Time Zone Atlantic / Faroe | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onTórshavn location_onKlaksvík location_onFuglafjørður location_onMiðvágur location_onTvøroyri location_onSandur | |
| Time Zone Atlantic / Madeira | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onFunchal location_onCâmara de Lobos location_onSão Martinho location_onSanto António location_onCaniço location_onMachico location_onSanta Maria Maior location_onSão Roque location_onEstreito de Câmara de Lobos location_onSantana | |
| Time Zone Europe / Amsterdam | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onRotterdam location_onAmsterdam location_onThe Hague location_onUtrecht location_onGroningen location_onEindhoven location_onTilburg location_onBreda location_onNijmegen location_onAlmere Stad | |
| Time Zone Europe / Andorra | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onAndorra la Vella location_onles Escaldes location_onEncamp location_onSant Julià de Lòria location_onla Massana location_onCanillo location_onOrdino | |
| Time Zone Europe / Athens | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onAthens location_onThessaloníki location_onPátra location_onPiraeus location_onLárisa location_onPeristéri location_onIrákleion location_onKallithéa location_onAcharnés location_onKalamariá | |
| Time Zone Europe / Belgrade | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onBelgrade location_onPristina location_onNiš location_onNovi Sad location_onPrizren location_onZemun location_onKragujevac location_onČačak location_onMitrovicë location_onSubotica | |
| Time Zone Europe / Berlin | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onBerlin location_onHamburg location_onMunich location_onKöln location_onFrankfurt am Main location_onStuttgart location_onDüsseldorf location_onEssen location_onDortmund location_onDresden | |
| Time Zone Europe / Bratislava | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onBratislava location_onKošice location_onPetržalka location_onNitra location_onPrešov location_onŽilina location_onBanská Bystrica location_onTrnava location_onTrenčín location_onMartin | |
| Time Zone Europe / Brussels | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onBrussels location_onAntwerpen location_onGent location_onCharleroi location_onLiège location_onAnderlecht location_onSchaerbeek location_onBrugge location_onNamur location_onLeuven | |
| Time Zone Europe / Bucharest | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onBucharest location_onSector 3 location_onIaşi location_onSector 6 location_onConstanţa location_onSector 2 location_onSector 4 location_onCluj-Napoca location_onSector 5 location_onBraşov | |
| Time Zone Europe / Budapest | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onBudapest location_onPest location_onBuda location_onDebrecen location_onSzeged location_onMiskolc location_onPécs location_onBudapest XI. kerület location_onZugló location_onGyőr | |
| Time Zone Europe / Chisinau | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onChisinau location_onTiraspol location_onBălţi location_onBender location_onRîbniţa location_onCahul location_onUngheni location_onSoroca location_onDurleşti location_onOrhei | |
| Time Zone Europe / Copenhagen | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onCopenhagen location_onÅrhus location_onOdense location_onAalborg location_onFrederiksberg location_onEsbjerg location_onRanders location_onKolding location_onHorsens location_onVejle | |
| Time Zone Europe / Dublin | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onDublin location_onSouth Dublin location_onCork location_onLimerick location_onGalway location_onTallaght location_onWaterford location_onSwords location_onDrogheda location_onDundalk | |
| Time Zone Europe / Gibraltar | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onGibraltar location_onReclamation Areas location_onSouth District | |
| Time Zone Europe / Guernsey | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onSaint Peter Port location_onVale Parish location_onSaint Sampson location_onSaint Pierre du Bois Parish location_onForest Parish location_onSt Martin location_onSaint Andrew location_onCastel location_onSaint Saviour location_onSt Anne | |
| Time Zone Europe / Helsinki | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onHelsinki location_onEspoo location_onTampere location_onVantaa location_onOulu location_onTurku location_onEast Helsinki location_onJyväskylä location_onKuopio location_onLahti | |
| Time Zone Europe / Isle_of_Man | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onDouglas location_onRamsey location_onPeel location_onPort Erin location_onCastletown location_onLaxey location_onBallaugh location_onOnchan location_onPatrick location_onPort Saint Mary | |
| Time Zone Europe / Jersey | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onSaint Helier location_onLe Hocq | |
| Time Zone Europe / Kyiv | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onKyiv location_onKharkiv location_onOdesa location_onDnipro location_onDonetsk location_onLviv location_onZaporizhzhya location_onKryvyy Rih location_onMykolayiv location_onVinnytsya | |
| Time Zone Europe / Lisbon | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onLisbon location_onPorto location_onBraga location_onAmadora location_onCoimbra location_onLeiria location_onSetúbal location_onViseu location_onQueluz location_onCacém | |
| Time Zone Europe / Ljubljana | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onLjubljana location_onMaribor location_onCelje location_onKranj location_onKoper location_onNovo Mesto location_onVelenje location_onPtuj location_onTrbovlje location_onKamnik | |
| Time Zone Europe / London | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 2:00 am to 1:00 am |
Major Cities in Time Zonelocation_onLondon location_onBirmingham location_onGlasgow location_onManchester location_onSheffield location_onLeeds location_onEdinburgh location_onLiverpool location_onBristol location_onCardiff | |
| Time Zone Europe / Luxembourg | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onLuxembourg location_onEsch-sur-Alzette location_onDudelange location_onBonnevoie-Sud location_onBelair location_onLimpertsberg location_onGare location_onKirchberg location_onGasperich location_onBelvaux | |
| Time Zone Europe / Madrid | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onMadrid location_onBarcelona location_onValencia location_onZaragoza location_onSevilla location_onMálaga location_onMurcia location_onPalma location_onAlicante location_onBilbao | |
| Time Zone Europe / Malta | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onSan Pawl il-Baħar location_onBirkirkara location_onMosta location_onSliema location_onQormi location_onŻabbar location_onNaxxar location_onSan Ġwann location_onSwieqi location_onSan Ġiljan | |
| Time Zone Europe / Mariehamn | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onMariehamn location_onYtterby location_onYomala | |
| Time Zone Europe / Monaco | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onMonaco location_onMonte-Carlo location_onLa Condamine location_onLa Rousse location_onJardin Exotique | |
| Time Zone Europe / Oslo | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onOslo location_onBergen location_onTrondheim location_onStavanger location_onKristiansand location_onDrammen location_onLillestrøm location_onSandnes location_onFredrikstad location_onSandefjord | |
| Time Zone Europe / Paris | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onParis location_onMarseille location_onLyon location_onToulouse location_onNice location_onNantes location_onMarne La Vallée location_onStrasbourg location_onBordeaux location_onMontpellier | |
| Time Zone Europe / Podgorica | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onPodgorica location_onNikšić location_onHerceg Novi location_onPljevlja location_onBudva location_onBar location_onBijelo Polje location_onCetinje location_onBerane location_onUlcinj | |
| Time Zone Europe / Prague | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onPrague location_onBrno location_onOstrava location_onPilsen location_onLiberec location_onOlomouc location_onČeské Budějovice location_onHradec Králové location_onÚstí nad Labem location_onPardubice | |
| Time Zone Europe / Riga | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onRiga location_onDaugavpils location_onLiepāja location_onJelgava location_onJūrmala location_onVentspils location_onRēzekne location_onValmiera location_onOgre location_onJēkabpils | |
| Time Zone Europe / Rome | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onRome location_onMilan location_onNaples location_onTurin location_onPalermo location_onGenoa location_onBologna location_onFlorence location_onBari location_onCatania | |
| Time Zone Europe / San_Marino | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onSerravalle location_onDogana location_onValdragone location_onBorgo Maggiore location_onSan Marino location_onDomagnano location_onFiorentino location_onAcquaviva location_onFaetano location_onPoggio di Chiesanuova | |
| Time Zone Europe / Sarajevo | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onSarajevo location_onBanja Luka location_onZenica location_onTuzla location_onMostar location_onBihać location_onIlidža location_onLukavac location_onBugojno location_onBrčko | |
| Time Zone Europe / Skopje | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onSkopje location_onKumanovo location_onPrilep location_onBitola location_onČair location_onTetovo location_onKisela Voda location_onVeles location_onGostivar location_onShtip | |
| Time Zone Europe / Sofia | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onSofia location_onPlovdiv location_onVarna location_onBurgas location_onStara Zagora location_onRuse location_onPleven location_onSliven location_onPernik location_onShumen | |
| Time Zone Europe / Stockholm | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onStockholm location_onGöteborg location_onMalmö location_onUppsala location_onLinköping location_onÖrebro location_onSollentuna location_onUmeå location_onVästerås location_onSödermalm | |
| Time Zone Europe / Tallinn | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onTallinn location_onTartu location_onNarva location_onPärnu location_onNõmme location_onKohtla-Järve location_onViljandi location_onMaardu location_onRakvere location_onKuressaare | |
| Time Zone Europe / Tirane | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onTirana location_onDurrës location_onVlorë location_onElbasan location_onShkodër location_onLushnjë location_onBerat location_onFier-Çifçi location_onKorçë location_onFier | |
| Time Zone Europe / Vaduz | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onSchaan location_onTriesen location_onVaduz location_onBalzers location_onEschen location_onMauren location_onTriesenberg location_onRuggell location_onGamprin location_onSchellenberg | |
| Time Zone Europe / Vatican | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onVatican City | |
| Time Zone Europe / Vienna | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onVienna location_onGraz location_onLinz location_onFavoriten location_onDonaustadt location_onFloridsdorf location_onSalzburg location_onInnsbruck location_onOttakring location_onSimmering | |
| Time Zone Europe / Vilnius | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 4:00 am to 3:00 am |
Major Cities in Time Zonelocation_onVilnius location_onKaunas location_onKlaipėda location_onŠiauliai location_onPanevėžys location_onDainava (Kaunas) location_onAlytus location_onŠilainiai location_onEiguliai location_onAntakalnis | |
| Time Zone Europe / Warsaw | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onWarsaw location_onKraków location_onWrocław location_onŁódź location_onPoznań location_onGdańsk location_onSzczecin location_onLublin location_onBydgoszcz location_onBiałystok | |
| Time Zone Europe / Zagreb | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onZagreb location_onSplit location_onRijeka location_onOsijek location_onZadar location_onSesvete location_onPula location_onSlavonski Brod location_onKarlovac location_onCentar | |
| Time Zone Europe / Zurich | |
|---|---|
| | Sunday, October 25, 20261 hour backFrom 3:00 am to 2:00 am |
Major Cities in Time Zonelocation_onZürich location_onGenève location_onBasel location_onLausanne location_onBern location_onWinterthur location_onLuzern location_onSankt Gallen location_onLugano location_onBiel/Bienne | |
A time zone is a geographical area that has the same state-regulated time, known as "standard time".
Due to the size of some countries and the spread of other places belonging under their jurisdiction, one country can be divided into a number of time zones. The United States, for example, contain twenty-nine time zones.
The use of time zones makes it easier for us to organise our lives, from commercial operations up to traveling. People living within the same time zone know that they will be working at the same time, while someone in another time zone will work based on the local time of his or her own time zone.
Time has traditionally been measured according to the position of the sun in the sky, which is different depending on where you are in the world. In the nineteenth century, when mechanical clocks began to become popular, time was calculated locally. Since the time calculations were based on the position of the sun, they could vary by four minutes for each degree of longitude. A better system was required to enable an efficient operation of railways and new telecommunication systems.
In 1847, British railway companies began to standardize the time they were using by providing their staff with portable chronometers, resulting in what became known as ‘Railway Time’. However, in 1855, the Royal Greenwich Observatory started transmitting time signals and in 1880, the Greenwich Mean Time (GMT) became the country’s official standard time.
Other countries created their own standard times and, in the late 1880s, the International Meridian Conference proposed a standardised 24-hour day, starting off at midnight GMT. Eventually the rest of the world began to use this system, shaping the time zones we know today.
UTC, also known as Universal Time Coordinated, replaced the Greenwich Mean Time (GMT) in 1961 as the time calculation system by which all zones calculated their time. It’s based on the International Atomic Time (TAI), a high-precision time calculation which is composed of an average time of more than 200 atomic clocks around the world, although UTC is slightly behind the International Atomic Time.
The world’s time zones are usually shown as either a positive (i.e. ‘+’ a specified number of hours UTC, meaning ahead of UTC) or a negative deviation of UTC (i.e. ‘-’ a specified number of hours UTC, meaning behind UTC).
The Daylight Saving Time is used by many countries during the summer, including the United Kingdom, Germany, Holland, Spain and France and in most American States, so that it is longer daylight in the evenings and longer dark in the mornings. In regions that are using Daylight Saving Time the clocks are typically moved forward by one hour at the beginning of the spring and moved back again by an hour in autumn.
The system, which is usually attributed the English-born astronomer and entomologist George Vernon Hudson, was first introduced in Germany during World War I to save coal by requiring less light in the evening. Other countries, including the UK, soon followed Germany.
Standard time is the name used for the uniform time created by the synchronization of all clocks within a time zone. In the UK, the standard time was introduced in the mid-nineteenth century, when clocks were set according to the Greenwich Mean Time (GMT), shown on the clock on the Prime Meridian at the Royal Observatory in Greenwich, London.
Standard times in other time zones around the world were shown as deviations from GMT until 1961 when the Universal Time Coordinated (UTC) was introduced.
The standard time of countries using the Daylight Savings Time is usually given without taking the DST into account.
Time differences between time zones are simple to work out due to the Universal Time Coordinated (UTC). Standard times are shown as positive or negative deviations of UTC, that's why time differences are calculated by determining UTC and calculating each time zone from there. If applicable, differences to standard times as a result of DST also need to be taken into account.
The simplest way to figure out the time in another part of the world is to make use of this website. It will help you to discover what cities are in which time zones and it will give you the standard times within each time zone. Furthermore, it will do time difference calculations for you.