Europe/Guernsey. The standard UTC offset is UTC+0 in winter. During daylight saving time (summer), it becomes Western European Summer Time (WEST) at UTC+1.Europe/Guernsey. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'Europe/Guernsey' })`), Python (`pytz.timezone('Europe/Guernsey')`), or any IANA-compatible library.