{"action":"opened","issue":{"url":"https://api.github.com/repos/moment/moment-timezone/issues/283","labels_url":"https://api.github.com/repos/moment/moment-timezone/issues/283/labels{/name}","comments_url":"https://api.github.com/repos/moment/moment-timezone/issues/283/comments","events_url":"https://api.github.com/repos/moment/moment-timezone/issues/283/events","html_url":"https://github.com/moment/moment-timezone/issues/283","id":123737365,"number":283,"title":"BST not supported(?)","user":{"login":"philip-peterson","id":1326208,"avatar_url":"https://avatars.githubusercontent.com/u/1326208?v=3","gravatar_id":"","url":"https://api.github.com/users/philip-peterson","html_url":"https://github.com/philip-peterson","followers_url":"https://api.github.com/users/philip-peterson/followers","following_url":"https://api.github.com/users/philip-peterson/following{/other_user}","gists_url":"https://api.github.com/users/philip-peterson/gists{/gist_id}","starred_url":"https://api.github.com/users/philip-peterson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/philip-peterson/subscriptions","organizations_url":"https://api.github.com/users/philip-peterson/orgs","repos_url":"https://api.github.com/users/philip-peterson/repos","events_url":"https://api.github.com/users/philip-peterson/events{/privacy}","received_events_url":"https://api.github.com/users/philip-peterson/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-12-23T23:44:00Z","updated_at":"2015-12-23T23:44:00Z","closed_at":null,"body":"Hey there, I'm not sure if this is a bug or if I'm just missing something, but... when I do a calculation across the change to British Summer Time (BST) which is supposed to happen on March 27, 2016, I do not seem to be getting the right interval.\r\n\r\n```\r\nvar x = moment.tz('2016-03-01', 'Europe/London');\r\nvar y = moment.tz('2016-03-31', 'Europe/London');\r\n\r\nconsole.log(y.diff(x)/1000/60/60/24) // yields 30\r\n```\r\n\r\nAs you can see here, I am diffing two dates (one before BST begins, one after) and finding the number of 24-hour periods that have passed. One would expect that the number be slightly below 30 because of the hour that was skipped in the transition to BST, but 30 is the exact result. Are BST time differences not supported yet -- or am I doing something wrong?"}}