{"id":694,"date":"2012-03-25T09:11:00","date_gmt":"2012-03-25T09:11:00","guid":{"rendered":"http:\/\/www.b.shuttle.de\/hayek\/Hayek\/Jochen\/wp\/blog-en\/2012\/03\/25\/avm-has-a-daylight-saving-time-problem-with-their-fritzbox-and-fritzfon-products\/"},"modified":"2012-03-25T09:11:00","modified_gmt":"2012-03-25T09:11:00","slug":"avm-has-a-daylight-saving-time-problem-with-their-fritzbox-and-fritzfon-products","status":"publish","type":"post","link":"https:\/\/wp.jochen.hayek.name\/blog-en\/2012\/03\/25\/avm-has-a-daylight-saving-time-problem-with-their-fritzbox-and-fritzfon-products\/","title":{"rendered":"AVM has a daylight saving time problem with their FRITZ!Box and FRITZ!Fon products"},"content":{"rendered":"<div>\nMy FRITZ!Box 7390 synchronises properly with the NTP servers, but it does not take the DST (&#8220;daylight saving time&#8221;, in German: &#8220;Sommerzeit&#8221;) into account, that started last night over here in Germany (e.g.).<\/div>\n<div>\n<\/div>\n<div>\nWhen I log in to my box, it shows the date (day and time) like this:<\/div>\n<div>\n<blockquote><p>\n<span>$ telnet fritz.box<br \/>\n# date<br \/>\nSun Mar 25 10:05:09 CET 2012<\/span><\/p><\/blockquote>\n<\/div>\n<div>\nIt should show this instead:<\/div>\n<div>\n<div>\n<blockquote><p>\n<span>Sun Mar 25 11:05:09 CEST 2012<\/span><\/p><\/blockquote>\n<\/div>\n<\/div>\n<div>\nThe time itself is alright, just the DST is not.<\/div>\n<div>\n<\/div>\n<p>On the\u00a0<a href=\"http:\/\/www.ip-phone-forum.de\/\">IP-Phone-Forum<\/a> there are currently 2 threads dealing with the issue:<\/p>\n<div>\n<ul>\n<li>one on its &#8220;<a href=\"http:\/\/www.ip-phone-forum.de\/forumdisplay.php?f=457\">FRITZ!Box Fon: Internet<\/a>&#8221; subforum: &#8220;<a href=\"http:\/\/www.ip-phone-forum.de\/showthread.php?t=246881\">[Fritz!Box 7390] Umstellung auf Sommerzeit erfolgte nicht<\/a>&#8220;,<\/li>\n<li>one on its &#8220;<a href=\"http:\/\/www.ip-phone-forum.de\/forumdisplay.php?f=607\">Fritz!Mini, M2, MT-C, MT-D, MT-F, C3<\/a>&#8221; subforum: &#8220;<a href=\"http:\/\/www.ip-phone-forum.de\/showthread.php?t=246880\">Keine autom. Aktualisierung auf Sommerzeit?<\/a>&#8220;; here I found the most thorough description of the situation: &#8220;<a href=\"http:\/\/www.ip-phone-forum.de\/showthread.php?t=246880&amp;p=1818489\">Es ist ein Problem mit der Zeitzone<\/a>&#8220;.<\/li>\n<\/ul>\n<div>\nAnother look inside the box:<\/p>\n<blockquote><p>\n<span><span># ls -l \/etc\/TZ<br \/>lrwxrwxrwx \u00a0 \u00a01 root \u00a0 \u00a0 root \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 7 Mar \u00a02 16:01 \/etc\/TZ -&gt; \/var\/TZ<br \/># ls -l \/var\/TZ<br \/>lrwxrwxrwx \u00a0 \u00a01 root \u00a0 \u00a0 root \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a019 Mar 25 11:01 \/var\/TZ -&gt; \/etc\/default.049\/TZ<br \/># ls -l \/etc\/default.049\/TZ<br \/>-rwxrwxrwx \u00a0 \u00a01 root \u00a0 \u00a0 root \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a045 Mar \u00a02 16:01 \/etc\/default.049\/TZ<br \/># cat \/etc\/default.049\/TZ<br \/>CET-1CEST-2,M3.5.0\/02:00:00,M10.5.0\/03:00:00<\/span><\/span><\/p><\/blockquote>\n<p>The TZ file looks like it&#8217;s writable, but it&#8217;s on a read-only filesystem.<\/p>\n<p>The constituents of &#8220;M3.5.0&#8221; mean this:<\/p>\n<ul>\n<li>The &#8220;3&#8221; means the 3rd month of the year.<\/li>\n<li>The &#8220;0&#8221; means the 0th day of the week, i.e. the Sunday.<\/li>\n<li>The &#8220;5&#8221; means neither the 1st through 4th, but the <u>last<\/u> Sunday.<\/li>\n<\/ul>\n<div>\nLooks like AVM&#8217;s software has a problem with determining the right date for the last Sunday of March in 2012.<\/div>\n<div>\nOn my blog in German I am referring to an article in a German magazine, that shows how and where to change the timezone &#8220;manually&#8221;. (Somebody on the IP-Phone-Forum quoted that article, and that&#8217;s how I found it.) My fix for 2012: replace that &#8220;5&#8221; by &#8220;4&#8221;!<\/p>\n<p>Update 2012-03-26: AVM look like they don&#8217;t want to announce a fix for this problem within the next couple of days [<a href=\"http:\/\/www.avm.de\/de\/News\/artikel\/2012\/uhrzeit_fritzfon.html\">Link<\/a>].<\/p>\n<p>Update 2012-03-28: AVM provide a &#8220;Labor&#8221; firmware update.<\/p>\n<p>A heise Netze article (in German) on the topic [<a href=\"http:\/\/www.heise.de\/netze\/meldung\/Fritz-Boxen-verschlafen-Zeitumstellung-1479870.html\">link<\/a>].<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>My FRITZ!Box 7390 synchronises properly with the NTP servers, but it does not take the DST (&#8220;daylight saving time&#8221;, in German: &#8220;Sommerzeit&#8221;) into account, that started last night over here in Germany (e.g.). When I log in to my box, it shows the date (day and time) like this: $ telnet fritz.box # date Sun [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_share_on_mastodon":"0"},"categories":[666],"tags":[],"class_list":["post-694","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"share_on_mastodon":{"url":"","error":""},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paO0kP-bc","jetpack_likes_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts\/694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/comments?post=694"}],"version-history":[{"count":0,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts\/694\/revisions"}],"wp:attachment":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/media?parent=694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/categories?post=694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/tags?post=694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}