When & Why do we change the time on our clocks?


This is quite a unique phenomenon practiced all over the world in many countries. This is done to make the most use of the daylight that is available to us depending on the geography of the place. However, it is important to note that not all of the countries around the world do this. What is it actually? You ask. Well, this basically pertains to all of the clocks within a country being turned one hour forward in spring. And setting the clock back by an exact one hour in autumn. This is basically done to add an hour of daylight in spring and compensate for it in autumn when we already have long days

This extra hour of daylight could then be conveniently used by people to go out with their families as they will be getting free from their office and other official duties an hour ahead. And will ultimately have the time to go on and do what they want to do while the sun is still up. This idea was first proposed by George Hudson from New Zealand, who initially proposed a 2-hour time shift in clocks so that he along with his friends would have more time to go for bug hunting in the summer. A few years later, this idea was appreciated by William Willett who then proposed this in front of the Parliament as a suggestion for saving daylight time of the people of the whole wide nation

Two of the many people who supported this idea were Winston Churchill and Sir Arthur Conan Doyle. But this didn’t stop the idea from being rejected in the start by the parliament. But eventually, this idea started gaining some popularity and was first materialized by the German Government.

A bit more about how it began

The idea of DST was firstly implemented on a whole nation on April 30th, 1916 as a way for the germans to conserve as much energy as they could. Soon, this decision was followed by many other countries that were fighting in World War 1. It was only after four years of the first implementation in Germany that the United States Government also deemed fit to pass its first daylight saving Law in 1918. This act of the parliament went on to even defining different time zones for its different states

Some effects of the Daylight saving time

Though the amount of daylight time that people have in the DST using area is more. There are some effects that it has on the overall state, which might sound a bit peculiar. like the following

  • More use of the world wide web during working hours: It was found in a 2012 Journal of Applied Psychology study that the incidences of roaming on the internet increased in over 200 metropolitan U.S. regions during the first Monday after daylight saving time in the spring, in comparison with the Mondays directly before and one week after the transition. The team further concluded that this was due the lack of sleep which ultimately led to people feeling more Lethargic and unmotivated to get actual work done
  • An increase in work-related injuries: This can prove to be quite a big consequent especially for people who work in construction companies and jobs that require moving a lot of moving around and body-strength. It was said by the  Journal of Applied Psychology study that was held in 2009 that studied actual mine workers and saw that they arrived at work with 40 minutes less sleep due to DST. And ultimately were 5.7% more prone to workplace injuries in the week directly following the springtime daylight saving transition than during any other days of the year. Moreover, the researchers went on to conclude that this was also due to the lack of the sleep they got due to DST as their was no such increase during the autumn time when the workers were getting just another hour to rest in their beds and sleep
  • People having more headaches: This is another effect that is prompted due to DST. This effect can obviously vary from person to person, but there are people that are more affected by the sudden change in their overall routine. As not all bodies are that good at adapting such stuff

Why do we still use DST?

Nearly 40% of the countries around the world still use DST around the world as of now. The countries that do this do it for the same reason and that as we said is to give their residents an hour more of daylight. The regions that are near the Pole like Australia are the ones that see the most change after implementing DST. Moreover, DST also leads to lesser artificial light and lesser energy consumption as people would be able to rely on sunlight more. This is more the case for countries as you move away from the Equator as this logic doesn’t really stand much for countries near the equator and on it

When does the DST( Daylight saving Time ) start and end?

It varies from place to place so down below is a list from Wikipedia Opens in a new tab.about all the DSTs around the world

Country/TerritoryContinent/SubregionDST start
DST end
 AfghanistanAsia
 Akrotiri and Dhekelia (UK)AsiaLast Sunday MarchLast Sunday October
 AlbaniaEuropeLast Sunday MarchLast Sunday October
 AlgeriaAfrica
 American Samoa (US)Oceania
 AndorraEuropeLast Sunday MarchLast Sunday October
 AngolaAfrica
 Anguilla (UK)West Indies
 Antigua and BarbudaWest Indies
 ArgentinaSouth America
 ArmeniaAsia
 Aruba (NL)West Indies
 Ascension (UK)Africa
 AustraliaOceaniaFirst Sunday of October at 02:00First Sunday of April at 02:00
 AustriaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 AzerbaijanAsia & Europe
 Bahamas, TheWest IndiesSecond Sunday MarchFirst Sunday November
 BahrainAsia
 Baker Island (US)Oceania
 BangladeshAsia
 BarbadosWest Indies
 BelarusEurope
 BelgiumEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 BelizeCentral America
 BeninAfrica
 Bermuda (UK)Northern AmericaSecond Sunday MarchFirst Sunday November
 BhutanAsia
 BoliviaSouth America
 Bonaire (NL)West Indies
 Bosnia and HerzegovinaEuropeLast Sunday MarchLast Sunday October
 BotswanaAfrica
 BrazilSouth America
 British Virgin Islands (UK)West Indies
 BruneiAsia
 BulgariaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Burkina FasoAfrica
 BurundiAfrica
 CambodiaAsia
 CameroonAfrica
 CanadaNorthern AmericaSecond Sunday March at 02:00 (for most of Canada)First Sunday November at 02:00 (for most of Canada)
 Cape VerdeAfrica
 Cayman Islands (UK)West Indies
 Central African RepublicAfrica
 ChadAfrica
 ChileSouth AmericaFirst Sunday SeptemberFirst Sunday April
 ChinaAsia
 Christmas Island (AU)Oceania
 Cocos (Keeling) Islands (AU)Oceania
 ColombiaSouth America
 ComorosAfrica
 Cook Islands (NZ)Oceania
 Congo, Democratic Republic of theAfrica
 Congo, Republic of theAfrica
 Costa RicaCentral America
 CroatiaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 CubaWest IndiesSecond Sunday MarchFirst Sunday November
 Curacao (NL)West Indies
 CyprusAsiaLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Czechia (Czech Republic)EuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 DenmarkEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 DjiboutiAfrica
 DominicaWest Indies
 Dominican RepublicWest Indies
 East TimorAsia
 EcuadorSouth America
 EgyptAfrica & Asia
 El SalvadorCentral America
 Equatorial GuineaAfrica
 EritreaAfrica
 EstoniaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Eswatini (Swaziland)Africa
 EthiopiaAfrica
 Faroe Islands (DK)EuropeLast Sunday MarchLast Sunday October
 Falkland Islands (UK)South America
 FijiOceaniaFirst Sunday NovemberThird Sunday January
 FinlandEuropeLast Sunday MarchLast Sunday October
 FranceEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 French Guiana (FR)South America
 French Polynesia (FR)Oceania
 French Southern Territories (FR)Africa
 GabonAfrica
 Gambia, TheAfrica
 GeorgiaAsia & Europe
 GermanyEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 GhanaAfrica
 GreeceEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Greenland (DK)Northern AmericaSaturday before last Sunday March at 22:00 local time onSaturday before last Sunday October at 23:00 local time on
 GrenadaWest Indies
 Guadeloupe (FR)West Indies
 Guam (US)Oceania
 GuatemalaCentral America
 Guernsey (UK)EuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 GuineaAfrica
 Guinea-BissauAfrica
 GuyanaSouth America
 HaitiWest IndiesSecond Sunday MarchFirst Sunday November
 Heard and McDonald Islands (AU)Oceania
  Holy See (Vatican City)EuropeLast Sunday MarchLast Sunday October
 HondurasCentral America
 Hong Kong (CN)Asia
 Howland Island (US)Oceania
 HungaryEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 IcelandEurope
 IndiaAsia
 IndonesiaAsia & Oceania
 IraqAsia
 IranAsiaMarch 21–22September 21–22
 IrelandEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Isle of Man (UK)EuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 IsraelAsiaFriday before last Sunday MarchLast Sunday October
 ItalyEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Ivory CoastAfrica
 JamaicaWest Indies
 JapanAsia
 Jersey (UK)EuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 JordanAsiaLast Friday MarchLast Friday October
 KazakhstanAsia & Europe
 KenyaAfrica
 KiribatiOceania
 Korea, Democratic People’s Republic ofAsia
 Korea, Republic ofAsia
 KosovoEuropeLast Sunday MarchLast Sunday October
 KuwaitAsia
 KyrgyzstanAsia
 LaosAsia
 LatviaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 LebanonAsiaLast Sunday MarchLast Sunday October
 LesothoAfrica
 LiberiaAfrica
 LibyaAfrica
 LiechtensteinEuropeLast Sunday MarchLast Sunday October
 LithuaniaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 LuxembourgEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Macau (CN)Asia
 MadagascarAfrica
 MalawiAfrica
 MalaysiaAsia
 MaldivesAsia
 MaliAfrica
 MaltaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Marshall IslandsOceania
 Martinique (FR)West Indies
 MauritaniaAfrica
 MauritiusAfrica
 MexicoCentral AmericaFirst Sunday AprilLast Sunday October
 Micronesia, Federated States ofOceania
 Midway Island (US)Oceania
 MoldovaEuropeLast Sunday MarchLast Sunday October
 MonacoEuropeLast Sunday MarchLast Sunday October
 MongoliaAsia
 MontenegroEuropeLast Sunday MarchLast Sunday October
 Montserrat (UK)West Indies
 MoroccoAfrica
 MozambiqueAfrica
 Myanmar (Burma)Asia
 NamibiaAfrica
 NauruOceania
   NepalAsia
 NetherlandsEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 New Caledonia (FR)Oceania
 New ZealandOceaniaLast Sunday SeptemberFirst Sunday April
 NicaraguaCentral America
 NigerAfrica
 NigeriaAfrica
 Niue (NZ)Oceania
 Norfolk Island (AU)OceaniaFirst Sunday of October at 2:00 amFirst Sunday of April at 2:00 am
 Northern Mariana Islands (US)Oceania
 North MacedoniaEuropeLast Sunday MarchLast Sunday October
 NorwayEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 OmanAsia
 PakistanAsia
 PalauOceania
 PalestineAsia
 PanamaCentral America & South America
 Papua New GuineaOceania
 ParaguaySouth AmericaFirst Sunday OctoberFourth Sunday March
 PeruSouth America
 PhilippinesAsia
 Pitcairn Islands (UK)Oceania
 PolandEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 PortugalEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Puerto Rico (US)West Indies
 QatarAsia
 RomaniaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 RussiaEurope & Asia
 RwandaAfrica
 Saba (NL)West Indies
 Saint Barthélemy (FR)West Indies
 Saint Helena (UK)Africa
 Saint Kitts and NevisWest Indies
 Saint LuciaWest Indies
 Saint Martin (FR)West Indies
 Saint Pierre and Miquelon (FR)Northern AmericaSecond Sunday MarchFirst Sunday November
 Saint Vincent and the GrenadinesWest Indies
 SamoaOceaniaLast Sunday SeptemberFirst Sunday April
 San MarinoEuropeLast Sunday MarchLast Sunday of October
 São Tomé and PríncipeAfrica
 Saudi ArabiaAsia
 SenegalAfrica
 SerbiaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 SeychellesAfrica
 Sierra LeoneAfrica
 SingaporeAsia
 Sint Eustatius (NL)West Indies
 Sint Maarten (NL)West Indies
 SlovakiaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 SloveniaEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Solomon IslandsOceania
 SomaliaAfrica
 South AfricaAfrica
 South Georgia and the South Sandwich Islands (UK)South America
 South SudanAfrica
 SpainEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 Sri LankaAsia
 SudanAfrica
 SurinameSouth America
 SwedenEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
  SwitzerlandEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 SyriaAsiaLast Friday MarchLast Friday October
 TaiwanAsia
 TajikistanAsia
 TanzaniaAfrica
 ThailandAsia
 TogoAfrica
 Tokelau (NZ)Oceania
 TongaOceania
 Trinidad and TobagoWest Indies
 Tristan da Cunha (UK)Africa
 TunisiaAfrica
 TurkeyAsia & Europe
 TurkmenistanAsia
 Turks and Caicos (UK)West IndiesSecond Sunday MarchFirst Sunday November
 TuvaluOceania
 UgandaAfrica
 UkraineEuropeLast Sunday MarchLast Sunday October
 United Arab EmiratesAsia
 United KingdomEuropeLast Sunday March at 01:00 UTCLast Sunday October at 01:00 UTC
 United StatesNorthern America & OceaniaSecond Sunday MarchFirst Sunday November
 United States Virgin Islands (US)West Indies
 UruguaySouth America
 UzbekistanAsia
 VanuatuOceania
 VenezuelaSouth America
 VietnamAsia
 Wallis and Futuna (FR)Oceania
 Western SaharaAfricaMay 31Apr 19
 YemenAsia
 ZambiaAfrica
 ZimbabweAfrica

Hopefully, this article was helpful in clearing some of your queries about DST and why and when countries all around the world change their times throughout the year twice.  And if you want to know why clocks don’t appear in dreams, we have a great article on just that so do give it a click if you are interested “Why don’t clocks appear in dreams? Clocks and dreams!Opens in a new tab.“. And stay tuned to ohmyclock for more interesting articles about clocks

AK Iqbal

A University of London’ student with a passion for writing. Clocks have always intrigued me and the importance that they have in our lives is way beyond phenomenal. So, on this site, I write everything about clocks, everything from answering any clock-related queries that you might have along with recommending some of my favorite clocks accordingly. Moreover, I will also be conducting some researches on clock related topics and sharing the things that I learn. So stay tuned to ohmyclock for all the fun clocks related content

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