Exact time with seconds in Guernsey and Alderney and timezones

Guernsey and Alderney are islands located off the coast of Normandy, France. They are both part of the Bailiwick of Guernsey, an archipelago that is a dependency of the Crown. The official time zone of Guernsey is Greenwich Mean Time (GMT). However, the islands also observe British Summer Time with Daylight Saving Time, which shifts the time difference between the islands and the mainland from UTC+0 to UTC+1. As a result, during the Summer months, Guernsey and Alderney are one hour ahead of their neighbors in continental Europe.