Calendar using the wrong time zone? What to check

Your calendar event appears an hour early, a day late, or at a time that does not match the invitation. Changing the event time right away can make things worse if the calendar is already converting it correctly.

Compare the event with the time in the intended location, then check the event, calendar account, and device settings separately. The World Clock can help you compare the current time in different places.

Check which time zone is changing the event

1. Open World Clock and compare the current time where you are with the place named in the invitation. Check the date as well as the hour, especially if the event is near midnight.
2. Open the event details and note its date, time, and time zone. Look for a location or time-zone field, and check whether the invitation names a city, region, or UTC offset.
3. Check the calendar's main time zone in its settings. It may be different from the time zone attached to this one event.
4. Check the device's date, time, and time zone. If the device clock is correct but the calendar is not, the issue is more likely in the event or calendar account.
5. Compare the event with the original invitation or message. Confirm whether the sender gave the time in their local zone or yours before editing anything.

For example, a meeting at 3:00 p.m. in New York may appear as 12:00 p.m. on a calendar set to Pacific time. That difference is expected if both places observe the relevant daylight saving rules. The event is wrong only if the displayed local time does not match the time you agreed to attend.

What the result means

Every event is shifted by the same number of hours

The calendar account or device may be set to the wrong time zone. Check both before changing individual events. If the device clock shows the right local time but every calendar event is shifted, start with the calendar's general time-zone setting.

Only one event has the wrong time

That event may have its own time zone, or it may have been entered as a local time in the wrong place. Open its details and compare them with the invitation. Correct the event's time zone or time, rather than changing the whole calendar.

Events changed by an hour around a seasonal clock change

The event may use a fixed UTC offset instead of a location-based time zone. An offset such as UTC-5 stays fixed, while a region such as America/New_York can change its offset when daylight saving time starts or ends. Use the named region when the event is meant to follow local clock rules.

All-day events appear on the day before or after

All-day events are dates, not meetings at midnight. A time-zone mismatch can make a calendar display the date differently, especially for imported events. Check that the event is marked all day and that the calendar's main time zone matches your intended location.

How to fix it

1. Check the event's own time zone. Open the event and look for a time-zone option in its details or editing view. Choose the named city or region intended by the organizer, then verify the resulting local time before saving.
2. Set the calendar's main time zone. Open the calendar's settings and find its general time-zone setting. Choose your current location, not the location of a single meeting. Many calendars have a separate time-zone choice inside each event.
3. Set the device's time zone. On Windows 11, go to Settings › Time & language › Date & time. On a Mac, go to System Settings › General › Date & Time. If the device is traveling, confirm that its time zone reflects where you are now.
4. Check automatic time and location settings. On Windows 11, review Set time automatically and Set time zone automatically under Settings › Time & language › Date & time. On a Mac, check the automatic time and time-zone options in System Settings › General › Date & Time. Automatic location-based time-zone detection can fail if location access is off.
5. Check your phone's time zone. On an iPhone, open Settings › General › Date & Time. On Android, open Settings › System › Date & time, though the wording can vary by phone. Check automatic time zone and compare it with the calendar app's own time-zone setting.
6. Refresh the calendar after changing a setting. Close and reopen the app or reload the calendar page. If it still shows the old time, sign out and back in, or check the same calendar on another device. Do not drag an event to a new time until you know whether the calendar is converting it.

Why daylight saving time can change the display

Time zones are not always a simple fixed number of hours from UTC. Some regions move their clocks seasonally, and other regions do not. The difference between two locations can therefore change during the year. A calendar using a named location can apply those changes to future events, while a manually entered UTC offset may not.

When scheduling with someone in another region, include the city or time zone in the invitation and confirm the displayed time on your own calendar. If an event was imported from a file or copied from a different calendar, check its time-zone setting before changing its date.