To undo a change to one date in a recurring event, edit that occurrence—not the entire series—and confirm the scope before saving. The exact controls depend on your calendar app. In Outlook, choose the single-event option; in Google Calendar, the documented Trash steps restore deleted events, not arbitrary edits to events that still exist.
First determine whether you edited or deleted the occurrence
An event that is still on your calendar but has the wrong time, title, or other details needs a correction. A deleted event needs recovery. Those are different actions: Google Calendar documents restoring deleted events from Trash, but that does not establish a general way to roll back an edit to an event that remains on the calendar.
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Before changing anything, identify the calendar app and version, then check whether the action should affect one occurrence, that occurrence and all later ones, or the entire series. Choosing a broader scope than intended can change other dates.
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- Double-click the meeting you created.
- Select Edit the one event in the series. Do not select Edit series or Edit this and all following events if you intend to change only one date.
- Correct the details and save. If it is a meeting you organized, follow the prompt to send an update where required.
These labels and steps are described by Microsoft Support’s Outlook instructions, which list New Outlook for Windows and multiple Outlook editions.
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Classic Outlook
- Open the recurring event.
- When Outlook asks which event to open, choose Just this one, not The entire series.
- Make the correction. For a meeting you organized, Microsoft says you must send an update to save changes.
Classic Outlook may limit changing the date or time of one instance if the change would skip over an earlier or later occurrence. If you are an attendee rather than the organizer, you may not be able to change meeting details; the organizer controls them.
Outlook.com
When editing a recurring event, choose This event for the selected date. Avoid This and all following events and All events in the series unless you intend those broader changes. In Outlook.com, use Save for a personal appointment; use Send for a meeting with attendees. See Microsoft’s Outlook.com instructions.
Restore a deleted occurrence in Google Calendar
Google’s documented recovery route applies to deleted events, not to an event that remains on the calendar with incorrect details.
- On a computer, open Google Calendar.
- Open Settings, then Trash.
- Choose Restore beside the event you want back.
Google Calendar Help says deleted events remain in Trash for 30 days. A single deleted occurrence appears as an individual row. If several instances were deleted together, they may appear as one row; restoring that row restores all instances in that deletion group. Events deleted with This and following do not go to Trash and cannot be restored there. See Google Calendar Help: Delete an event.
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What to do when a change is wrong but the event remains
For Outlook, reopen the affected occurrence and correct it using the single-event scope. For Google Calendar, the cited official help explains Trash recovery but does not describe a general user-interface procedure to restore any previous field values on an event that still exists. Do not use Trash instructions as an edit rollback.
Google’s Calendar API describes an individual change to a recurring instance as an exception: a client retrieves that instance and updates it. The guide also cautions against changing instances individually when the intended scope is the whole event or all following instances. This explains the distinction between an occurrence and a series, but it is developer documentation, not a Calendar user-interface walkthrough: Google Calendar API: Recurring events.
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Check the scope and attendee update before finishing
- Verify that the selected option refers to one event, not the series or that event plus following dates.
- Review the date and time after saving to make sure the correction landed on the intended occurrence.
- If you organized a meeting, check whether Outlook requires you to send an update to attendees. Do not assume the change is silent.
- If you are an invitee and the meeting details are locked, ask the organizer to make the correction.
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