Hi @Asyaint
According to our official documentation, Teams will reflect the same date and time format as your device's language, date, and time settings. For example, if your device's display language is set to English (United States), the date and time in Teams will display the regional format used in the United States.
If the problem persists, please turn off your VPN, try switching to another language and then switching back to the language you need, log out of Teams and log in again.
If you need guidance on setting the language display or time zone display, please refer to this.
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