With this update, date/time formats in Teams will match the Mac and Windows OS regional settings on desktop. Previously, Teams would only show date/time in the format corresponding to the application language.
When this will happen
Standard and GCC: Rollout starts mid-April, and completes in late April.
How this will affect your organization
If users in your organization have regional settings set to a language different than the application language, their date and time formatting will now reflect the appropriate date/time format for your OS regional setting.
Note: Only the Gregorian calendar is supported, regardless of the OS calendar setting.
What you need to do to prepare
You might want to notify your users about this new capability and update your training and documentation as appropriate.