Fix Outlook Calendar Invite Showing Wrong Date for Attendees

Confirm whether the meeting was initially created in the Outlook desktop app, Outlook on the web, or Microsoft Teams, as this dictates which server handles the time formatting.

Ask affected attendees to log into Outlook on the web (Outlook.com) or Teams on the web to see if the date displays correctly there. This isolates whether the issue is local to the desktop client.

Have both the organizer and attendees navigate to File > Options > Calendar in Outlook desktop, and verify that the 'Time zones' section matches their actual physical location.

Ensure that the Windows or Mac system time zone settings match the Outlook calendar time zone for both parties to prevent daylight saving miscalculations.

In Outlook, go to File > Account Settings > Account Settings and check if the organizer and attendee accounts are configured as Exchange, IMAP, or POP.

If using Microsoft Exchange, navigate to the Send/Receive tab on the ribbon and click 'Update Folder' while in the Calendar view to force a synchronization with the server.

If the date remains incorrect across all platforms and both parties use Exchange, gather screenshots of the discrepancy from both the organizer and attendees, and submit them to Microsoft Support for backend investigation.