This article describes how you can customize Thunderbird's date and time formats using regional settings or override preferences. = Choose Thunderbird date and time formats defined by operating system or application locale = By default, Thunderbird will use date and time formats according to the regional settings of your operating system. If you have more than one language pack installed for Thunderbird, and if the regional settings of your operating system are different from your current Thunderbird user interface language, you can also choose the application locale for Date and Time Formatting: {note} ≡ > Preferences > General > Date and Time Formatting ><br>

This article describes how you can customize Thunderbird's date and time formats using regional settings or override preferences.

Choose Thunderbird date and time formats defined by operating system or application locale

By default, Thunderbird will use date and time formats according to the regional settings of your operating system. If you have more than one language pack installed for Thunderbird, and if the regional settings of your operating system are different from your current Thunderbird user interface language, you can also choose the application locale for Date and Time Formatting: