{"id":1258,"date":"2008-10-30T09:00:56","date_gmt":"2008-10-30T09:00:56","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2008\/10\/working-out-when-windows-updates-the-clocks-as-daylight-saving-begins-and-ends.htm"},"modified":"2008-10-30T09:01:15","modified_gmt":"2008-10-30T09:01:15","slug":"working-out-when-windows-updates-the-clocks-as-daylight-saving-begins-and-ends","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2008\/10\/working-out-when-windows-updates-the-clocks-as-daylight-saving-begins-and-ends.htm","title":{"rendered":"Working out when Windows updates the clocks as daylight saving begins and ends"},"content":{"rendered":"

I can’t always answer e-mails for help through this blog (I simply don’t have the time) but, a few days ago, I received an e-mail from a reader with a question that intrigued me – at what time did Windows update the system clock when British Summer Time ended last weekend? I knew that the official end time was 02:00 (and it’s 01:00 when the clocks go forward again in the spring) but there was nothing in the logs to indicate the time when Windows applied the changes.<\/p>\n

After a bit of research I found that this information is written to the registry when the time zone is selected at setup time, or via the Control Panel date and time applet. On my Windows Server 2008 system, reg query hklm\\system\\currentcontrolset\\control\\timezoneinformation<\/code> returned:<\/p>\n

HKEY_LOCAL_MACHINE\\system\\currentcontrolset\\control\\timezoneinformation
\n    Bias    REG_DWORD    0x0
\n    DaylightBias    REG_DWORD    0xffffffc4
\n    DaylightName    REG_SZ    @tzres.dll,-261
\n    DaylightStart    REG_BINARY    00000300050001000000000000000000
\n    DynamicDaylightTimeDisabled    REG_DWORD    0x0
\n    StandardBias    REG_DWORD    0x0
\n    StandardName    EG_SZ    @tzres.dll,-262
\n    StandardStart    EG_BINARY    00000A00050002000000000000000000
\n    TimeZoneKeyName    REG_SZ    GMT Standard Time
\n    ActiveTimeBias    REG_DWORD    0x0<\/em><\/p>\n

It’s the daylightstart and standardstart values that are of interest here – reg query hklm\\system\\currentcontrolset\\control\\timezoneinformation \/v daylightstart<\/code> returns:<\/p>\n

HKEY_LOCAL_MACHINE\\system\\currentcontrolset\\control\\timezoneinformation
\n    daylightstart    REG_BINARY    00000300050001000000000000000000<\/em><\/p>\n

and reg query hklm\\system\\currentcontrolset\\control\\timezoneinformation \/v standardstart<\/code> shows:<\/p>\n

HKEY_LOCAL_MACHINE\\system\\currentcontrolset\\control\\timezoneinformation
\n    standardstart    REG_BINARY    00000A00050002000000000000000000<\/em><\/p>\n

Although I can’t work out the format of the binary data, I can see the differences. Ignoring the second 8 bytes (which is all zero) I can see that the differences are:<\/p>\n

00 00 03<\/strong> 00 05 00 01<\/strong> 00<\/p>\n

00 00 0A<\/strong> 00 05 00 02<\/strong> 00<\/p>\n

That looks to me like 03 might be March and 0A (decimal 10) might be October, whilst and 01 may represent 1am in which case 02 would be 2am.<\/p>\n

There’s also some more information in Microsoft knowledge base article 914387<\/a> including a link to the Windows Time Zone Editor (tzedit.exe<\/code>) utility that is used to create timezones (as well as to another utility for combing event logs).\"Windows The Windows Time Zone Editor is written for Windows 2000 and I’ve not been able to get the resulting time zone that I defined to load on my 64-bit copy of Windows Server 2008 in order to work out the resulting registry changes but I’m pretty sure that the 05 in the registry values for daylightstart and standardstart represents the last day (the options are 1st, 2nd, 3rd, 4th and last) and that one of the 00s is Sunday. One thing that it does do is to confirm that daylight saving for Greenwich Mean Time (British Summer Time) starts on the last Sunday of March at 01:00 and ends on the last Sunday in October at 02:00 – as shown in the accompanying image.<\/p>\n

If anyone knows any more about the bytes I haven’t tracked down yet, I’d be pleased to hear your comments!<\/p>\n","protected":false},"excerpt":{"rendered":"

I can’t always answer e-mails for help through this blog (I simply don’t have the time) but, a few days ago, I received an e-mail from a reader with a question that intrigued me – at what time did Windows update the system clock when British Summer Time ended last weekend? I knew that the … Continue reading Working out when Windows updates the clocks as daylight saving begins and ends<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[33],"class_list":["post-1258","post","type-post","status-publish","format-standard","hentry","tag-windows"],"yoast_head":"\nWorking out when Windows updates the clocks as daylight saving begins and ends - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2008\/10\/working-out-when-windows-updates-the-clocks-as-daylight-saving-begins-and-ends.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Working out when Windows updates the clocks as daylight saving begins and ends - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"I can’t always answer e-mails for help through this blog (I simply don’t have the time) but, a few days ago, I received an e-mail from a reader with a question that intrigued me – at what time did Windows update the system clock when British Summer Time ended last weekend? 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In an e-mail sent from Microsoft to registered users for the Windows Update Services Open Evaluation Program, Microsoft state that: \"There are two primary drivers behind this schedule change: The March release of the\u2026","rel":"","context":"In \"Microsoft\"","block_context":{"text":"Microsoft","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/microsoft"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":88,"url":"https:\/\/www.markwilson.co.uk\/blog\/2004\/08\/windows-server-2003-time-service-not.htm","url_meta":{"origin":1258,"position":2},"title":"Windows Server 2003 time service not updating from Internet","author":"Mark Wilson","date":"Monday 9 August 2004","format":false,"excerpt":"The Windows Time service (W32Time) uses the Network Time Protocol (NTP) to help synchronize time across a network. NTP is an Internet time protocol that includes the algorithms necessary for synchronizing clocks and is required by the Kerberos authentication protocol in order to ensure that all computers within an enterprise\u2026","rel":"","context":"In \"Microsoft Windows Server 2003\"","block_context":{"text":"Microsoft Windows Server 2003","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/windows-server-2003"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":293,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/06\/owa-2003-activex-control-issues-from.htm","url_meta":{"origin":1258,"position":3},"title":"OWA 2003 ActiveX control issues from IE 6.0 and 7.0","author":"Mark Wilson","date":"Saturday 3 June 2006","format":false,"excerpt":"Since switching my everyday PC over to Windows Vista, I've been unable to reply to any e-mails using Outlook Web Access (OWA) whereby the reply pane opens, but the ActiveX control doesn't load. I tried various browser settings before a bit of googling turned up a thread on the microsoft.public.exchange.admin\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1120,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/07\/tracking-down-the-control-panel-applet-for-mail-in-64-bit-windows.htm","url_meta":{"origin":1258,"position":4},"title":"Tracking down the Control Panel applet for Mail in 64-bit Windows","author":"Mark Wilson","date":"Wednesday 16 July 2008","format":false,"excerpt":"At long last (and not before time), my corporate mail account has just been moved across to an Exchange Server 2007 system with Outlook Anywhere enabled. Unfortunately, I sold my Apple iPhone (which now has Exchange ActiveSync support) last week but I will be getting a new one at some\u2026","rel":"","context":"In \"Microsoft Exchange\"","block_context":{"text":"Microsoft Exchange","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/exchange"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5541,"url":"https:\/\/www.markwilson.co.uk\/blog\/2015\/04\/microsoft-news-q1-2015.htm","url_meta":{"origin":1258,"position":5},"title":"Microsoft News Q1 2015","author":"Mark Wilson","date":"Tuesday 14 April 2015","format":false,"excerpt":"This post is an edited version of one that originally appeared on my internal blog at Fujitsu. Louis Lazarus' Microsoft News Updates Back in December, I wrote\u00a0what I intended to be the first of a regular update on what\u2019s going on in the world of Microsoft \u2013 a sort of\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=1258"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1258\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=1258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=1258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=1258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}