Why a meeting time changes in one city but not another

You set up a meeting, but the time looks different in one city than it did last week. Meanwhile, a teammate in another city sees no change. This is usually caused by daylight saving time, which some places observe and others do not, or by places changing their clocks on different dates.

Use a world clock to compare the same date in both locations. Then check whether the calendar event is tied to a specific moment or a local time that repeats, since that affects how recurring meetings appear.

Compare the cities on the meeting date

1. Open the World Clock and add the cities where people will join from.
2. Set the date you care about, especially if the meeting is weeks or months away. Time differences can change during daylight saving transitions.
3. Compare the local times in each city. Write down the date as well as the hour, because midnight in one place may already be the next day elsewhere.
4. Check the same cities on a date before or after the difference appears to have changed. This helps show whether a clock change caused the shift.
5. Open the calendar event and confirm its time zone. For recurring meetings, check a later occurrence too, rather than relying only on the first date.

If your team needs a shared view for more than two places, see how to build a world clock for an online team.

What the time difference means

The gap changes for a few weeks

The cities probably change their clocks on different dates. For example, the United States and the United Kingdom do not begin daylight saving time on the same Sunday. During the weeks between those transitions, the time difference between cities such as New York and London is one hour smaller than usual. It changes again when the second location adjusts its clocks.

The exact dates depend on local rules, and governments can change them. Check the dates for the year of your meeting instead of assuming the transition always happens on the same calendar date.

The gap changes and stays changed

One place may observe daylight saving time while the other does not. When the first place moves its clocks forward or back, the difference changes and can remain different for much of the year. Some regions do not change their clocks at all.

The meeting date moves by one day

Time zones can put cities on different calendar dates at the same moment. A meeting late in the evening for one person may be early the next morning for someone farther east. Check the date shown next to the local time, not just the hour.

Only a recurring meeting shifts

A calendar may preserve the organizer's local meeting time across daylight saving changes. If the organizer's city changes clocks before a participant's city, the participant may see the meeting move by an hour for a period. The meeting's underlying time zone and the calendar app's handling of recurring events determine what each person sees.

The cities match, but one calendar is different

The device or calendar may have the wrong time zone, or the event may have been created in a different zone than expected. A manually entered time without a time zone can also be interpreted differently when someone views it elsewhere.

How to fix a meeting time mismatch

1. Confirm the event's time zone. Edit the meeting and check the time zone attached to its start time. If the event needs to happen at the same moment worldwide, keep one specific event time and let each calendar show its local equivalent.
2. Check whether it is a recurring event. A weekly meeting intended to stay at 10 a.m. in the organizer's city may appear at a different local hour for others after a clock change. If the group needs a fixed time for every participant, review the series around each city's transition dates and adjust it deliberately.
3. Check your device's time zone. On Windows 11, open Settings › Time & language › Date & time. On macOS, open System Settings › General › Date & Time. On iPhone, check Settings › General › Date & Time; on Android, check Settings › System › Date & time, though the wording can vary by manufacturer.
4. Turn on automatic time zone if you travel. If your device remains set to a previous location, calendar times may look wrong. Enable automatic time zone in the same date and time settings, or select the correct zone manually.
5. Update the event instead of sending a bare time. Share the calendar invitation or include the date, time, and named time zone, such as “10:00 a.m. New York time.” This is clearer than saying only “10:00 a.m.”
6. Check the next occurrence after an edit. Calendar apps can handle a single event and a recurring series differently. Verify the changed date from the organizer's view and from a participant's calendar.

Why daylight saving time creates temporary differences

Daylight saving time is a local clock rule, not a global switch. In places that observe it, clocks usually move forward in spring and back in fall. Other places keep the same clock time throughout the year, and places that both observe it may switch on different dates.

That means a meeting's time difference can change temporarily even when nobody edits the invitation. The clock change alters the local label for the same moment. For an important meeting, check both locations on the exact date and include the relevant time zone in your message.