If the time on the Day/Week calendar is off by one hour the week after DST changed, also see Daylight Saving Time Calendar Display Bugs, especially if you use two time zones. This is caused by a "display bug" and will go away "next week" or if you switch to the Work Week view.
When I send or receive meeting requests or view other people's calendars, the appointments are off by one hour.
This is caused by incorrect time or time zone settings on one of the computers.
- Verify all computers involved are set to the correct time, time zone and Daylight Saving Time settings in Windows' Date/Time settings. You can open Date and Time in Windows 10 by right-clicking on the time in the notification tray and choosing Adjust Date/Time.
- Verify the settings are also correct in Outlook. File, Options, Calendar, Time Zones (The settings should be identical and a change made in one location should reflect in the other.)
You need to use a time zone with the correct DST settings for your location. If your location does not observe DST, DO NOT choose a time zone that does then deselect the option to automatically update for daylight saving time. You need to use a time zone that does not observe DST.
If you receive an iCalendar that does not include time zone offsets in the ical, Outlook may place the appointment on your calendar using standard time, not current time. For example, if you subscribe to an Internet calendar that does not include DST information, Outlook will treat the events as referencing standard time and move them ahead an hour if they occur when DST is in effect. As a result, an appointment scheduled for noon will be on the calendar at 1 PM.