You can't change the time and date in Teams, but you can in Windows.
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In Windows, go to Start , type Date & time, and select Date & Time settings.
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Turn off Set time automatically and Set time zone automatically.
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Select Change under Set the date and time manually to set the time and date.
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Under Time zone, select the dropdown and choose a time zone to use.
To schedule a meeting in a different time zone, see Change the time zone for a meeting.