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This article describes how you can customize Thunderbird's date and time formats using regional settings or override preferences.
≡ > Preferences > General > "Config Editor":.
- intl.date_time.pattern_override.date_short = yyyy-MM-dd
- intl.date_time.pattern_override.time_short = HH:mm
- intl.date_time.pattern_override.connector_short = {1}'T'{0}
