Daylight Saving Time Explained: Why Meeting Times Shift Twice a Year

If you schedule meetings with people in different countries, you may notice that the time difference between you changes during the year. A meeting that normally takes place at 9:00 AM in one country and 2:00 PM in another might shift by an hour, even though neither person changed their working schedule.

This happens because of Daylight Saving Time (DST). Some regions adjust their clocks seasonally, while others keep the same time throughout the year. Because countries do not always change their clocks on the same dates, international time differences can temporarily become confusing.

Understanding Daylight Saving Time makes it easier to schedule international meetings, coordinate remote teams, plan travel, and avoid missed appointments. A timezone converter can help you translate a proposed meeting time between locations, while a world clock lets you compare local times in multiple cities at once.

What Is Daylight Saving Time?

Daylight Saving Time is a seasonal clock adjustment intended to shift an hour of daylight from the early morning toward the evening.

In regions that observe DST, clocks typically move forward by one hour in spring and backward by one hour in autumn. The exact dates depend on local laws.

The familiar phrase is spring forward, fall back.

• Spring: Clocks move forward by one hour. A clock showing 1:59 AM may jump directly to 3:00 AM.
• Autumn: Clocks move backward by one hour. The hour between 1:00 AM and 2:00 AM may occur twice, depending on the location.

Not every country follows this practice. Many countries use the same official time throughout the year, and some countries that once observed DST have discontinued it.

Why Do Meeting Times Change Twice a Year?

The main reason international meeting times shift is that locations do not all follow the same seasonal clock rules.

Imagine a remote team with members in New York and London. Both cities observe DST, but they change their clocks on different dates. For a few weeks in spring and autumn, the time difference between the cities is different from what team members normally expect.

For example, New York is generally five hours behind London during part of the year. When the United States and United Kingdom are observing different seasonal time arrangements, that difference can temporarily shrink to four hours.

This means a meeting scheduled for 10:00 AM in New York may appear at a different local time in London than it did a week earlier.

The meeting itself has not moved. The local clocks have changed relative to one another.

When Do Clocks Change in 2026?

The dates depend on the country or region. These examples illustrate why international schedules can be affected at different times of the year.

Dates shown are for 2026. Australia and New Zealand are in the Southern Hemisphere, so their seasonal clock changes occur at the opposite time of year from those in the Northern Hemisphere. Rules can also vary within a country.

Sources: NIST — Daylight Saving Time rules and timeanddate.com — Daylight Saving Time around the world in 2026.

Which Regions Do Not Observe Daylight Saving Time?

Many places do not change their clocks seasonally. Some have relatively little variation in daylight throughout the year, while others have chosen to keep a consistent time for practical, economic, or administrative reasons.

The following are notable examples. This is a selection rather than a complete list of every country and territory.

Asia

Many Asian countries keep the same official time throughout the year. Examples include:

• India: Does not observe DST.
• China: Uses a single official time nationwide and does not observe DST.
• Japan: Does not observe DST.
• South Korea: Does not observe DST.
• Singapore: Does not observe DST.
• Thailand: Does not observe DST.
• Indonesia: Does not observe DST.

For international meetings, this means the local clock in these locations does not shift because of a seasonal DST change. However, the time difference between these places and countries that do observe DST can still change.

Africa

Most African countries do not observe DST. Examples include:

• Nigeria
• South Africa
• Kenya
• Ghana
• Tanzania
• Ethiopia

There are exceptions, so it is best to check the specific city rather than assume every African location follows the same rules.

South America

Many South American countries do not currently observe DST throughout their territory. Examples include:

• Colombia
• Peru
• Ecuador, apart from local exceptions such as the Galápagos Islands' distinct time zone
• Argentina
• Uruguay

Some regions, including parts of Chile, do change their clocks. Always verify the location and the year when planning a meeting.

North America and the Caribbean

DST is not universal across North America. Examples of places that do not observe it include:

• Hawaii
• Most of Arizona in the United States
• Puerto Rico
• Jamaica
• Costa Rica
• Panama

Most of the United States and Canada do observe DST, but there are regional exceptions. In Arizona, for example, most of the state does not observe DST, while the Navajo Nation does.

Australia and Nearby Regions

Australia has different rules depending on the state or territory.

New South Wales, Victoria, Tasmania, South Australia, and the Australian Capital Territory observe DST. Queensland, Western Australia, and the Northern Territory do not.

This can create a particularly confusing situation: two Australian cities can have different time differences from the same overseas city during part of the year, even though both are in Australia.

Why Countries Do Not All Change Their Clocks

There is no single global rule requiring countries to observe Daylight Saving Time.

One factor is geography. In tropical regions close to the equator, the amount of daylight often varies less between seasons, so shifting clocks may offer less practical benefit.

Other considerations include public preferences, business practices, energy policies, transport schedules, and government decisions. Some countries have also abandoned DST after using it in the past.

As a result, you should not assume that every country changes its clocks in March and October or November. The rules depend on the location and can change when governments update their time policies.

How Daylight Saving Time Affects International Meetings

DST can cause several scheduling problems for remote teams, international businesses, students, and families.

1. The Time Difference May Change Temporarily

A team might normally have a six-hour difference between two offices. After one location changes its clocks, that difference could become five or seven hours until the other location changes its clocks.

2. Recurring Meetings Can Appear at Different Local Times

A calendar invitation may remain fixed to the organizer's time zone, but its displayed local time can change for attendees elsewhere.

For example, a weekly meeting scheduled for 3:00 PM London time may shift by an hour for someone in New York during the weeks when the United States and United Kingdom have different DST schedules.

3. Some Local Times Occur Twice or Not at All

When clocks move forward, certain local times are skipped. When clocks move backward, some times occur twice.

This can affect overnight shifts, travel plans, software scheduling, and appointments near the clock-change period.

4. Time Zone Abbreviations Can Be Misleading

Abbreviations such as EST and EDT do not mean the same thing: EST is Eastern Standard Time, while EDT is Eastern Daylight Time. Their UTC offsets differ by one hour.

When scheduling across regions, it is safer to use the named city or time zone and confirm the date instead of relying on an abbreviation alone.

How to Convert Meeting Times Correctly

A timezone converter is useful when you already know the proposed meeting time and want to find the corresponding time elsewhere.

Follow these steps:

1. Choose the date of the meeting.
2. Select the organizer's city or time zone.
3. Enter the proposed meeting time.
4. Select the destination city or time zone.
5. Check the converted time and date, including whether the meeting falls on the previous or following day.

You can use a timezone converter to compare a specific appointment across locations. Be sure to enter the actual meeting date, because the correct conversion depends on the DST rules in effect on that day.

Use a World Clock to Compare Multiple Cities

When you coordinate with several people, converting each time individually can become tedious. A world clock lets you see local times in multiple cities side by side.

For example, a team might monitor:

• New York, United States
• London, United Kingdom
• Dubai, United Arab Emirates
• Mumbai, India
• Singapore
• Sydney, Australia

A world clock makes it easier to compare working hours and identify a suitable meeting window. It is particularly useful when some locations observe DST and others do not.

For recurring meetings, review the schedule again when either location approaches a clock-change date. A meeting that works well today might become inconvenient for one participant a few weeks later.

Tips for Avoiding Daylight Saving Time Confusion

Use these practical habits when arranging meetings across time zones:

• Include the date. "Tuesday at 10 AM" is less clear than a full date and time.
• Name the time zone. Specify a city or a recognized zone instead of relying on a bare clock time.
• Use a converter for the exact date. This accounts for seasonal clock rules in both locations.
• Check recurring meetings around clock changes. Pay particular attention to March, October, and November, depending on the regions involved.
• Remember the Southern Hemisphere. Australia and New Zealand generally change clocks during different months from Europe and North America.
• Recheck regional exceptions. Countries such as the United States, Canada, and Australia have places that do not follow the same DST rules as the rest of the country.
• Use calendar invitations carefully. A properly configured calendar application can adjust displayed times automatically, but confirm the time zone when scheduling across regions.

Frequently Asked Questions

Does every country observe Daylight Saving Time?

No. Many countries keep the same official time throughout the year. DST is used in parts of North America, Europe, Oceania, and a smaller number of other regions, but it is not a worldwide standard.

Why does the time difference between countries change?

The difference changes when one location moves its clocks and another does not, or when they change clocks on different dates. The underlying time zones may stay the same while their seasonal UTC offsets change.

Do India, China, and Japan observe Daylight Saving Time?

No. India, China, and Japan do not observe DST in 2026. Their local clocks do not move forward or backward for a seasonal DST adjustment.

Does the entire United States change clocks?

No. Most of the United States observes DST, but Hawaii and most of Arizona do not. Several U.S. territories also do not observe it, and there are specific local exceptions.

Is Daylight Saving Time the same as changing time zones?

No. A time zone defines a region's standard time rules. DST is a seasonal adjustment that some regions apply to their clocks. A location may switch between standard time and daylight time without changing its geographic time zone.

What is the easiest way to schedule meetings across time zones?

Use a timezone converter for a specific meeting date and a world clock to compare the current local times in several cities. Recheck recurring meetings around DST transitions.

Final Thoughts

Daylight Saving Time can make international scheduling confusing because different locations follow different rules and change their clocks on different dates. Some places move forward and backward by an hour, while others—including India, China, Japan, and many countries in Africa—keep the same official time throughout the year.

The most reliable way to avoid missed meetings is to confirm the date, identify the relevant time zones, and check the conversion for that exact day. Use a timezone converter for individual appointments or a world clock to compare multiple cities at once.

Explore more useful tools for comparing information and coordinating across locations on the 100 MultiView homepage.