How Many Countries Observe DST?
Contrary to popular perception, daylight saving time is observed by a minority of the world's countries. Of the roughly 195 countries in the world, only about 70 currently observe DST — and that number has been shrinking steadily as countries across Asia, Africa, South America, and the Middle East have abolished it.
DST is primarily a phenomenon of Europe, North America, and a handful of countries in the Southern Hemisphere. The majority of the world's population — including the entire populations of China, India, Japan, and most of Africa and Southeast Asia — lives in countries that do not change their clocks.
This matters for developers and businesses: when you schedule an international meeting or calculate time differences, you cannot assume that other countries follow the same DST rules (or any DST rules) as your own country.
Asia: The World's Most Populous No-DST Region
Asia is home to the majority of the world's population, and the overwhelming majority of Asian countries do not observe DST:
- China — China standardized all of its territory to a single time zone (UTC+8) in 1949, and abolished DST in 1991. The country is so large that sunrise and sunset times vary enormously across its territory, but the government maintains the single time zone for national unity reasons.
- Japan — Japan observed DST briefly after World War II under US occupation (1948–1951) but abolished it in 1952 when occupation ended. The Japanese government has considered reintroducing DST several times, most recently around the 2020 Tokyo Olympics, but public opposition has consistently prevented it.
- India — India uses a single time zone (IST, UTC+5:30) for the entire country and does not observe DST. The half-hour offset itself is a historical compromise between the time zones of eastern and western India.
- South Korea — Abolished DST in 1988 after a brief period of observance in the 1980s.
- Singapore — Has been on a fixed UTC+8 since 1982.
- Thailand, Vietnam, Indonesia, Malaysia, Philippines — None of these countries observe DST. Most are close to the equator, where the difference in daylight hours between summer and winter is small enough that DST would provide minimal benefit.
- Bangladesh, Pakistan, Sri Lanka, Myanmar — Standard time only.
Africa: The Continent Without DST
Africa is the most uniform region in the world with respect to DST: with the rare exception of Morocco (which observes DST but pauses it during Ramadan, making its rules complex), no African country currently observes DST.
Egypt experimented with DST for many years but permanently abolished it in 2011. South Africa, Nigeria, Kenya, Ethiopia, Ghana, and all other major African nations operate on fixed standard times. The proximity of most of sub-Saharan Africa to the equator means daylight hours are relatively consistent year-round, making DST largely pointless.
Morocco is a notable edge case: it observes DST broadly but suspends it during the holy month of Ramadan (when fasting rules make an evening hour of light particularly valuable) and resumes it after Eid al-Fitr. This creates unusual time zone behavior that is notoriously difficult to handle in software — the IANA timezone database has to be updated each year with Morocco's DST suspension dates.
South America: Mostly No DST Since Brazil's 2019 Abolition
South America's DST picture changed dramatically in 2019 when Brazil — the continent's most populous country — permanently abolished daylight saving time under a decree by President Jair Bolsonaro. Brazil had observed DST for decades, but studies showing minimal energy savings and public health costs from clock disruption led to the change.
Countries in South America that do not observe DST include:
- Colombia — Has never observed DST; close to the equator.
- Ecuador — No DST; straddles the equator.
- Peru — Abolished DST in 1994.
- Venezuela — No DST; Hugo Chávez famously moved Venezuela to a unique UTC-4:30 offset in 2007 (later restored to UTC-4 in 2016).
- Bolivia — No DST.
- Brazil — Abolished DST in 2019 (all states now on standard time).
Chile and Paraguay still observe DST in the Southern Hemisphere (shifting clocks during their summer months, September–March).
Middle East: Shifting Away from DST
The Middle East has seen significant changes in DST policy in recent decades:
- Saudi Arabia — Has never observed DST.
- United Arab Emirates — No DST; UAE operates on UAE Standard Time (UTC+4) year-round.
- Qatar, Kuwait, Bahrain, Oman — None observe DST.
- Turkey — Turkey observed DST until 2016, when President Erdoğan decreed that clocks would be kept permanently on summer time (UTC+3), eliminating the autumn fall-back. Turkey is now effectively on permanent DST — UTC+3 year-round.
- Israel, Jordan, Lebanon, Iran — These countries do still observe DST, making them exceptions in the region.
Russia: Permanent Standard Time Since 2014
Russia is one of the most significant examples of a major country abandoning DST. After years of public complaints about the health effects of clock changes, President Putin signed a decree in 2014 moving Russia to permanent standard time — clocks were set back one hour in October 2014 and have not been changed since.
Russia's vast eastern regions are particularly affected: in Vladivostok and other far-eastern cities, the permanent standard time means that in summer, sunrise occurs as early as 3:00 AM and darkness falls before 8:00 PM. Some Russian regions have advocated for returning to DST or moving to permanent summer time, but no change has been made nationally.
Why Countries Abandon DST: Economic and Health Arguments
The case against DST has grown stronger with modern research:
- Health effects: A 2019 study in the journal Current Biology found that fatal traffic accidents increase by 6% in the week after the spring-forward transition. Studies in the American Journal of Cardiology have found statistically significant increases in heart attacks in the days following DST transitions. Sleep disruption from losing even one hour has measurable cognitive effects lasting up to a week.
- Energy savings are minimal: The original argument for DST was that it would reduce electricity consumption by shifting activity to natural daylight. Multiple modern studies, including a landmark study of Indiana (which began observing statewide DST only in 2006) found that DST actually increased energy consumption by 1–4% — because the shift in activity hours increased air conditioning demand in the evening more than it reduced lighting demand in the morning.
- Economic costs: The disruption to sleep schedules, scheduling complexity for global businesses, and the IT cost of maintaining DST-aware software all impose real economic costs. A 2016 study estimated that DST transitions cost the US economy approximately $434 million per year in lost productivity.
- Circadian alignment: Medical researchers increasingly argue that standard time (not permanent summer time) is better aligned with human circadian biology because it keeps solar noon closer to the middle of the waking day.
The Global Trend: Away from DST
The long-term trend is clearly toward the abolition of daylight saving time. In the past decade:
- Russia abolished DST (2014)
- Turkey moved to permanent summer time (2016)
- Most of Mexico abolished DST (2022)
- Brazil abolished DST (2019)
- The EU Parliament voted to abolish DST (2019, though not yet implemented)
- Multiple US states have passed legislation for permanent time (pending federal approval)
For developers building timezone-aware applications, this trend underscores the importance of using a regularly updated timezone database (such as the IANA TZDB) rather than hard-coding DST rules. Countries can and do change their DST policies with relatively short notice.
Frequently Asked Questions
How many countries observe daylight saving time?
Approximately 70 of the world's roughly 195 countries currently observe daylight saving time. The majority of the world's population — including the entire populations of China, India, Japan, and most of Africa — lives in countries that do not change their clocks.
Does Japan observe daylight saving time?
No. Japan briefly observed DST from 1948 to 1951 during US occupation after World War II but abolished it when the occupation ended. Despite periodic government discussions about reintroducing DST (most recently around the 2020 Tokyo Olympics), public opposition has consistently prevented it.
Does China observe daylight saving time?
No. China abolished DST in 1991 after experimenting with it for several years. The entire country uses a single time zone (UTC+8, Beijing Time) despite spanning five geographical time zones. The government maintains this policy for national administrative unity.
Why did Brazil abolish daylight saving time?
Brazil permanently abolished DST in 2019 under President Bolsonaro. Studies showed that the energy savings were minimal, and the clock changes caused measurable health effects including sleep disruption and increased accidents. Public support for the change was widespread.
Does India use daylight saving time?
No. India has not observed DST since 1942, when it was briefly used during World War II. India's relatively low latitude means daylight hours do not vary dramatically between seasons, so the potential energy savings from DST are negligible. India uses UTC+5:30 year-round.
Why don't countries near the equator use DST?
Countries near the equator experience roughly equal daylight and darkness year-round (approximately 12 hours each). Since the purpose of DST is to take advantage of longer summer daylight hours, it provides no meaningful benefit in tropical and equatorial regions where day length barely changes between seasons.
Is the trend toward abolishing or keeping DST?
The global trend is clearly toward abolishing DST. Russia (2014), Turkey (2016), Brazil (2019), and most of Mexico (2022) have all recently eliminated clock changes. The EU voted to abolish DST in 2019 (though implementation is stalled), and multiple US states have passed legislation favoring permanent time pending federal approval.
Sources
- IANA Time Zone Database (tzdata) — Current release notes
- timeanddate.com — DST World Map and Country List
- Giuntella O. et al. (2019). "Sunset Time and Human Capital." NBER Working Paper.
- Sandhu A. et al. (2014). "Daylight saving time and myocardial infarction." Open Heart.