{"id":27091,"date":"2019-10-29T16:20:22","date_gmt":"2019-10-29T20:20:22","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=27091"},"modified":"2019-10-29T16:20:22","modified_gmt":"2019-10-29T20:20:22","slug":"time-machine-beaten-by-the-clock","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2019\/10\/29\/time-machine-beaten-by-the-clock\/","title":{"rendered":"Time Machine Beaten by the Clock"},"content":{"rendered":"<p><a href=\"https:\/\/eclecticlight.co\/2019\/10\/29\/time-machine-beaten-by-the-clock-backup-fails-due-to-bug\/\">Howard Oakley<\/a>:<\/p>\n<blockquote cite=\"https:\/\/eclecticlight.co\/2019\/10\/29\/time-machine-beaten-by-the-clock-backup-fails-due-to-bug\/\">\n<p>Times here are given in UTC, which would a minute earlier have been an hour behind local time, so this backup would have actually started at 02:00:41 according to local clock time had the clocks not been changing that night. However, the clock change occurred at 02:00:00 local time, so for the second time that morning, the local time would have been showing 01:00:41, this time the same as UTC.<\/p>\n<p>These entries show Time Machine successfully making its three snapshots, and naming each com.apple.TimeMachine.2019-10-27-010127, in accordance with both UTC and local time, the latter having just changed.<\/p>\n<p>[&#8230;]<\/p>\n<p>By an odd quirk of fate, this backup chose to try to create its three snapshots at 02:01:27. For a reason I can&rsquo;t fathom, it decided to name those snapshots as if it was an hour ago, 01:01:27, which gave them identical names to those made during the last backup. Those snapshots failed because of the name conflict, and the whole backup was aborted as a result.<\/p>\n<\/blockquote>\n<p>He disagrees, but from what I see&mdash;farther from the prime meridian&mdash;Time Machine names its snapshot folders using local time, not UTC. So, even during normal operation, it&rsquo;s possible for two different instants in time to map to the same name.<\/p>\n<p>I&rsquo;d love to know why Apple doesn&rsquo;t use UTC in the filesystem. The restoration UI would still have the opportunity to format the dates for display using local time.<\/p>","protected":false},"excerpt":{"rendered":"<p>Howard Oakley: Times here are given in UTC, which would a minute earlier have been an hour behind local time, so this backup would have actually started at 02:00:41 according to local clock time had the clocks not been changing that night. However, the clock change occurred at 02:00:00 local time, so for the second [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"2019-10-29T20:20:26Z","apple_news_api_id":"379d58c6-520c-44e9-be7d-5c9da5fbca7f","apple_news_api_modified_at":"2019-10-29T20:20:27Z","apple_news_api_revision":"AAAAAAAAAAD\/\/\/\/\/\/\/\/\/\/w==","apple_news_api_share_url":"https:\/\/apple.news\/AN51YxlIMROm-fVydpfvKfw","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[2],"tags":[146,131,30,1609,364,216],"class_list":["post-27091","post","type-post","status-publish","format-standard","hentry","category-technology","tag-backup","tag-bug","tag-mac","tag-macos-10-14","tag-time","tag-timemachine"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/27091","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=27091"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/27091\/revisions"}],"predecessor-version":[{"id":27092,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/27091\/revisions\/27092"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=27091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=27091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=27091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}