{"id":428290,"date":"2026-07-31T06:06:23","date_gmt":"2026-07-31T04:06:23","guid":{"rendered":"https:\/\/www.jng-web.com\/ref-auto\/?p=428290"},"modified":"2026-05-28T06:07:40","modified_gmt":"2026-05-28T04:07:40","slug":"le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement","status":"publish","type":"post","link":"https:\/\/www.jng-web.com\/ref-auto\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\/","title":{"rendered":"Le bug de l\u2019an 2038 : le \u201cY2K\u201d des syst\u00e8mes Unix expliqu\u00e9 simplement"},"content":{"rendered":"<div id=\"6729917897\" class=\"advads-pub advads-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-4944504088214075\"\r\n     crossorigin=\"anonymous\"><\/script><\/div>\n<p class=\"wp-block-paragraph\">L\u2019informatique a ses dates fatidiques, ces moments o\u00f9 des limites techniques anciennes finissent par se rappeler \u00e0 nous. Apr\u00e8s le c\u00e9l\u00e8bre bug de l\u2019an 2000, un autre probl\u00e8me plus discret mais potentiellement s\u00e9rieux attend certains syst\u00e8mes : <strong>le bug de l\u2019an 2038<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u23f3 D\u2019o\u00f9 vient le probl\u00e8me ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pour comprendre ce bug, il faut regarder comment les ordinateurs enregistrent le temps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une grande partie des syst\u00e8mes informatiques (notamment ceux bas\u00e9s sur Unix et Linux) utilisent un syst\u00e8me appel\u00e9 <strong>temps Unix<\/strong>. Le principe est simple :<br>on compte le nombre de secondes \u00e9coul\u00e9es depuis le <strong>1er janvier 1970 \u00e0 00:00:00 UTC<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce compteur est souvent stock\u00e9 sur 32 bits dans les anciens syst\u00e8mes. Cela signifie qu\u2019il existe une limite maximale \u00e0 la valeur qu\u2019il peut repr\u00e9senter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udcc9 La limite des 32 bits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Un entier sign\u00e9 sur 32 bits peut repr\u00e9senter les valeurs suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>minimum : \u22122 147 483 648<\/li>\n\n\n\n<li>maximum : +2 147 483 647<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cela peut sembler \u00e9norme, mais ce plafond sera atteint un jour tr\u00e8s pr\u00e9cis :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udc49 <strong>19 janvier 2038 \u00e0 03:14:07 UTC<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 cet instant, le compteur de secondes atteint sa valeur maximale.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udca5 Que se passe-t-il ensuite ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Une fois la limite d\u00e9pass\u00e9e, quelque chose de probl\u00e9matique se produit : le compteur \u201cd\u00e9borde\u201d (on parle d\u2019<strong>overflow<\/strong>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Concr\u00e8tement :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la valeur devient n\u00e9gative<\/li>\n\n\n\n<li>le syst\u00e8me interpr\u00e8te cela comme une date tr\u00e8s ancienne<\/li>\n\n\n\n<li>certains appareils peuvent croire qu\u2019on est en <strong>1901<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00e9sultat : des comportements impr\u00e9visibles peuvent appara\u00eetre.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u26a0\ufe0f Quels syst\u00e8mes sont concern\u00e9s ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Heureusement, tous les syst\u00e8mes ne sont pas vuln\u00e9rables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le bug concerne surtout :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>les anciens syst\u00e8mes Unix\/Linux 32 bits<\/li>\n\n\n\n<li>les logiciels non mis \u00e0 jour<\/li>\n\n\n\n<li>certains syst\u00e8mes embarqu\u00e9s (machines industrielles, \u00e9quipements m\u00e9dicaux anciens, objets connect\u00e9s, etc.)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Les syst\u00e8mes modernes utilisent g\u00e9n\u00e9ralement des entiers <strong>64 bits<\/strong>, ce qui repousse le probl\u00e8me \u00e0 une \u00e9chelle\u2026 astronomique (bien au-del\u00e0 de la dur\u00e9e de vie de l\u2019univers actuel).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udee0\ufe0f Pourquoi ce bug existe-t-il encore ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On pourrait se demander : pourquoi ne pas avoir tout corrig\u00e9 ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En r\u00e9alit\u00e9, la situation est complexe :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>beaucoup de syst\u00e8mes industriels fonctionnent encore avec du mat\u00e9riel ancien<\/li>\n\n\n\n<li>certains \u00e9quipements sont difficiles ou co\u00fbteux \u00e0 mettre \u00e0 jour<\/li>\n\n\n\n<li>tout changer implique des tests tr\u00e8s stricts (surtout dans les domaines critiques)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83c\udf0d Faut-il s\u2019inqui\u00e9ter ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le sc\u00e9nario catastrophe est peu probable \u00e0 grande \u00e9chelle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pourquoi ?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les syst\u00e8mes critiques ont d\u00e9j\u00e0 \u00e9t\u00e9 migr\u00e9s dans leur majorit\u00e9<\/li>\n\n\n\n<li>Les \u00e9diteurs de logiciels travaillent sur le sujet depuis des ann\u00e9es<\/li>\n\n\n\n<li>Le probl\u00e8me est connu et anticip\u00e9<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mais comme pour le bug de l\u2019an 2000, la vraie difficult\u00e9 n\u2019est pas technique\u2026 elle est logistique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udde0 En r\u00e9sum\u00e9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Le bug de l\u2019an 2038 est un probl\u00e8me li\u00e9 \u00e0 une ancienne fa\u00e7on de compter le temps dans les syst\u00e8mes informatiques 32 bits. Lorsque la limite sera atteinte, certains syst\u00e8mes risquent de mal interpr\u00e9ter les dates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est un rappel int\u00e9ressant d\u2019une v\u00e9rit\u00e9 simple en informatique :<br>\ud83d\udc49 les choix techniques faits aujourd\u2019hui peuvent avoir des cons\u00e9quences des d\u00e9cennies plus tard.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019informatique a ses dates fatidiques, ces moments o\u00f9 des limites techniques anciennes finissent par se rappeler \u00e0 nous.<\/p>\n","protected":false},"author":1,"featured_media":253703,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"facebook_2944925605560295_361066357320011":"","twitter_792688215148855296_792688215148855296":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","_ayudawp_aiss_exclude":false,"_ayudawp_aiss_exclude_summary":false,"_ayudawp_aiss_summary":"Le bug concerne surtout :. les anciens syst\u00e8mes Unix\/Linux 32 bits. les logiciels non mis \u00e0 jour. certains syst\u00e8mes embarqu\u00e9s (machines industrielles, \u00e9quipements m\u00e9dicaux anciens, objets connect\u00e9s, etc.). Les syst\u00e8mes modernes utilisent g\u00e9n\u00e9ralement des entiers 64 bits, ce qui repousse le probl\u00e8me \u00e0 une \u00e9chelle\u2026 astronomique (bien au-del\u00e0 de la dur\u00e9e de vie de l\u2019univers actuel). \ud83d\udee0\ufe0f Pourquoi ce bug existe-t-il encore ?. En r\u00e9alit\u00e9, la situation est complexe :. beaucoup de syst\u00e8mes industriels fonctionnent encore avec du mat\u00e9riel ancien. certains \u00e9quipements sont difficiles ou co\u00fbteux \u00e0 mettre \u00e0 jour. tout changer implique des tests tr\u00e8s stricts (surtout dans les domaines critiques). \ud83c\udf0d Faut-il s\u2019inqui\u00e9ter ?.","_ayudawp_aiss_summary_provider":"extractive","_ayudawp_aiss_summary_hash":"76d2eb529c2211d810517e26d903afc97b82c981","footnotes":""},"categories":[13],"tags":[1162,1161,1163,1164],"class_list":["post-428290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internet-informatique","tag-an-2038","tag-bug","tag-unix","tag-y2k"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le bug de l\u2019an 2038 : le \u201cY2K\u201d des syst\u00e8mes Unix expliqu\u00e9 simplement - Optannu<\/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.jng-web.com\/ref-auto\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le bug de l\u2019an 2038 : le \u201cY2K\u201d des syst\u00e8mes Unix expliqu\u00e9 simplement - Optannu\" \/>\n<meta property=\"og:description\" content=\"L\u2019informatique a ses dates fatidiques, ces moments o\u00f9 des limites techniques anciennes finissent par se rappeler \u00e0 nous.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.jng-web.com\/ref-auto\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\/\" \/>\n<meta property=\"og:site_name\" content=\"Optannu\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-31T04:06:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.jng-web.com\/ref-auto\/wp-content\/uploads\/2025\/05\/black-and-white-creative-workspace-office-setup-picjumbo-com-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1706\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jerome\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jerome\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\\\/\"},\"author\":{\"name\":\"Jerome\",\"@id\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/#\\\/schema\\\/person\\\/9b9c81cd6753b27cc78a7072ecb82d8e\"},\"headline\":\"Le bug de l\u2019an 2038 : le \u201cY2K\u201d des syst\u00e8mes Unix expliqu\u00e9 simplement\",\"datePublished\":\"2026-07-31T04:06:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\\\/\"},\"wordCount\":522,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/le-bug-de-lan-2038-le-y2k-des-systemes-unix-explique-simplement\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.jng-web.com\\\/ref-auto\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/black-and-white-creative-workspace-office-setup-picjumbo-com-scaled.jpg\",\"keywords\":[\"an 2038\",\"bug\",\"unix\",\"y2k\"],\"articleSection\":[\"Internet &amp; 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