User is unable to modify the date and time of the calendar event

If Microsoft Teams is displaying the wrong time or timezone for you, there are a few steps you can take to try and resolve the issue:

Install-Module -Name ExchangeOnlineManagement -Scope CurrentUser
Import-Module ExchangeOnlineManagement
Connect-ExchangeOnline

Get-MailboxCalendarConfiguration -Identity nishant@ucadmin.info
Get-MailboxRegionalConfiguration -Identity nishant@ucadmin.info

Update Both Calendar and Regional Settings

Set-MailboxCalendarConfiguration -Identity nishant@ucadmin.info -WorkingHoursTimeZone “Eastern Standard Time”
Set-MailboxRegionalConfiguration -Identity nishant@ucadmin.info -WorkingHoursTimeZone “Eastern Standard Time”

Please replace “Eastern Standard Time” with your actual time zone as needed.

Note: Set-MailboxRegionalConfiguration uses -TimeZone, not -WorkingHoursTimeZone.

✅ Check Teams Settings

Sometimes Teams uses its own settings or caches. Try this:

1. Go to Settings in Teams.
2. Under General, check the Language and time zone.
3. Make sure the time zone matches your local time.

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✅ Check Outlook Web Settings

Teams pulls calendar data from Outlook. Go to:

• https://outlook.office.com
• Settings → View all Outlook settings → General → Language and time
• Confirm the time zone is correct.

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✅ Restart Teams / Clear Cache

After making changes, restart Teams or clear its cache:

1. Quit Teams.
2. Delete cache folders:
   • %appdata%\Microsoft\Teams
   • %localappdata%\Microsoft\Teams
3. Restart Teams.