Hello PC 9191
Welcome to the Microsoft Community.
I understand that your calendar time is displayed abnormally.
As for your problem, I have to ask a few questions here:
- Can I tell if you're using a Microsoft 365 business account (for example, @usercompanydomain.com), a Microsoft personal email account (for example, @outlook.com, @hotmail.com, or @live.com), or a third-party email provider account (@gmail.com or @yahoo.com)?
- Do you use a calendar shared by the browser? What address do you use? https://outlook.office.com/ ? https://outlook.live.com/ ?
- The date you mentioned is shown as 1889. Which location is it exactly? Can you share detailed screenshot information?
We look forward to hearing from you. With your help and more detailed information, we can work together to find a solution. Thank you for your cooperation.
Thank you for your patience and understanding.
Forry.F - MSFT | Microsoft Community Support Specialist