SharePoint .msg file preview shows Sent On in UTC instead of local time (UTC+10) — how to fix?

Hi Spandana Gali

After I did some testing, I saw the exact behavior as yours, and I understand how crucial this is in terms of accuracy and transparency of information.

Unfortunately, this behavior is by designed and currently, I have not found any workaround for this.

You can read here for more details: Date and time in SharePoint viewer is not the local date and time for .msg files - Microsoft Q&A

However, I tried changing Personal Time Zone Settings, converting .msg files to different formats but it does not change to Local Time.

Therefore, please upvote this feedback here via Timestamp wrong for Emails in preview - displayed as UTC - have you considered the impact on law fi…

This feedback has the same situation as yours, please upvote for it.

I apologize for not being able to provide you a definite solution. Thanks for your understanding.

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1. There is no supported way in SharePoint Online to change how the Sent On value inside a .msg file is rendered in the file preview from UTC to a specific local time zone. The preview is reading the timestamp stored in the file and displaying it according to its own logic; SharePoint time zone/regional settings affect SharePoint UI timestamps (such as Modified, Created, list item dates), not how embedded properties inside uploaded binary files are shown.
2. SharePoint and Microsoft 365 regional settings are designed to control how times are displayed for SharePoint and other Microsoft 365 service data (for example, list columns, site contents, Outlook/SharePoint user-level time zone display). As documented, user-level time zone and locale settings affect how times are displayed in Outlook, SharePoint, and other Microsoft 365 services, but they do not retroactively rewrite timestamps stored inside uploaded files such as .msg messages, nor do they change how the .msg previewer interprets those internal properties.
3. The provided information does not include a supported method to modify the internal Sent On MAPI property of a .msg file in a way that would cause SharePoint Online’s previewer to display it in local time instead of UTC. The NTFS file system stores time values in UTC so they are not affected by changes in time zone or daylight saving time, and the behavior described for timestamps is consistent with that model. Any modification of internal .msg MAPI properties prior to upload would be outside the documented SharePoint/Exchange/Outlook configuration options and is not covered by the referenced guidance.

Based on the available information, this behavior is by design and cannot be changed through SharePoint Online settings, regional settings, or supported configuration of the .msg files themselves.

References:

• Best practices for changing site creation time zone display in SharePoint admin center
• Changing a File Time to the Current Time