{"id":981,"date":"2013-06-28T03:09:47","date_gmt":"2013-06-28T01:09:47","guid":{"rendered":"http:\/\/blogs.chrisse.se\/?p=981"},"modified":"2023-06-06T17:00:31","modified_gmt":"2023-06-06T15:00:31","slug":"the-constructed-attribute-modifytimestamp-always-whenchanged","status":"publish","type":"post","link":"https:\/\/blog.chrisse.se\/?p=981","title":{"rendered":"The constructed attribute modifyTimeStamp always == whenChanged?"},"content":{"rendered":"\n

So if you read up on modifyTimeStamp \u2013 for example here: http:\/\/blog.joeware.net\/2006\/10\/03\/655\/<\/a> or at MSDN: http:\/\/msdn.microsoft.com\/en-us\/library\/windows\/desktop\/ms677125(v=vs.85).aspx<\/a> “modifyTimeStamp” is a constructed attribute and as Joe points out it’s based on the “whenChanged” attribute and that assumption is right in 99,9% of all cases, BUT not always \u2013 So where is the exception?<\/p>\n\n\n\n

The exceptional case<\/strong><\/span><\/p>\n\n\n\n

The exception is the DMD or the SubSchemaSubEntry “CN=Aggregate,CN=Schema,CN=Configuration,DC=X<\/span>“<\/p>\n\n\n\n

Let’s have a look with LDP.exe:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

So this clearly shows that ‘modifyTimeStamp’ is NOT based on the ‘whenChanged’ attribute for the subSchemaEntry.<\/p>\n\n\n\n

How it really works<\/strong><\/span><\/p>\n\n\n\n

Let’s agree we have confirmed that, so to the next question, what is it based on? Well it’s based on the last time the in-memory schema cache of the particular DC was updated either during boot or by manually triggering the operational attribute “SchemaUpdateNow:1”<\/p>\n\n\n\n

So let’s try that?<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

So let’s have a look again:<\/p>\n\n\n\n

<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n


Yes \u2013 “modifyTimeStamp” now shows todays date: 2013-06-28 instead of previously 2013-06-21 J<\/span><\/p>\n\n\n\n

Why it was implemented
<\/strong><\/span><\/p>\n\n\n\n

So I guess now there is really one good question left, why?<\/span><\/p>\n\n\n\n

The answer can be found if you read up on RFC 2251<\/a> that says:<\/p>\n\n\n\n

“modifyTimestamp: the time this entry was last modified” \u2013 you can read further on MSDN where you can see what functionality defined in RFC 2551 Active Directory has implemented: http:\/\/msdn.microsoft.com\/en-us\/library\/cc223231.aspx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

So if you read up on modifyTimeStamp \u2013 for example here: http:\/\/blog.joeware.net\/2006\/10\/03\/655\/ or at MSDN: http:\/\/msdn.microsoft.com\/en-us\/library\/windows\/desktop\/ms677125(v=vs.85).aspx “modifyTimeStamp” is a constructed attribute and as Joe points out it’s based on the “whenChanged” attribute and that assumption is right in 99,9% of all cases, BUT not always \u2013 So where is the exception? The exceptional case The … <\/p>\n

Continue reading “The constructed attribute modifyTimeStamp always == whenChanged?”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-981","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/posts\/981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=981"}],"version-history":[{"count":2,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/posts\/981\/revisions"}],"predecessor-version":[{"id":1064,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=\/wp\/v2\/posts\/981\/revisions\/1064"}],"wp:attachment":[{"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.chrisse.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}