diff --git a/tools/add_lego.js b/tools/add_lego.js
index d1032f40..01eaccbd 100644
--- a/tools/add_lego.js
+++ b/tools/add_lego.js
@@ -417,7 +417,7 @@ async function main() {
     const coverLine = coverFile ? `cover: images/${coverFile}\n` : '';
     const md = `---\n` +
                `title: "${pageTitle.replace(/"/g, '\\"')}"\n` +
-               `date: ${createdAt}\n` +
+               `date: "${createdAt}"\n` +
                coverLine +
                `---\n\n` +
                body;
diff --git a/tools/add_link.js b/tools/add_link.js
index e09e8670..575f329a 100644
--- a/tools/add_link.js
+++ b/tools/add_link.js
@@ -133,7 +133,7 @@ if (duplicateBundlePath) {
     let content = fs.readFileSync(indexPath, "utf8");
 
     // Inject date
-    content = content.replace(/^date: .*/m, `date: ${formattedEntryDate}`);
+    content = content.replace(/^date: .*/m, `date: "${formattedEntryDate}"`);
 
     // Inject status
     const statusEntry = `{"date": "${formattedStatusDate}", "http_code": ${metadata.httpStatus || "null"}}`;
diff --git a/tools/lib/datetime.js b/tools/lib/datetime.js
index c4bb91d1..8f766b47 100644
--- a/tools/lib/datetime.js
+++ b/tools/lib/datetime.js
@@ -32,6 +32,57 @@ function getHugoTimeZone() {
     return cachedTimeZone;
 }
 
+/**
+ * Parse une chaîne de date selon les formats Hugo attendus.
+ * @param {string} value Chaîne de date.
+ * @param {string} zone Fuseau horaire IANA.
+ * @param {number} defaultHour Heure par défaut si absente.
+ * @param {number} defaultMinute Minute par défaut si absente.
+ * @returns {import("luxon").DateTime|null} DateTime ou null si invalide.
+ */
+function parseHugoDateString(value, zone, defaultHour = 12, defaultMinute = 0) {
+    let trimmed = value.trim();
+    if (!trimmed) {
+        return null;
+    }
+    if (
+        (trimmed.startsWith("'") && trimmed.endsWith("'")) ||
+        (trimmed.startsWith("\"") && trimmed.endsWith("\""))
+    ) {
+        trimmed = trimmed.slice(1, -1).trim();
+    }
+
+    const iso = DateTime.fromISO(trimmed, { setZone: true });
+    if (iso.isValid) {
+        return iso.setZone(zone);
+    }
+
+    const formats = [
+        "yyyy-LL-dd HH:mm:ss",
+        "yyyy-LL-dd'T'HH:mm:ss",
+        "yyyy-LL-dd HH:mm",
+        "yyyy-LL-dd'T'HH:mm",
+        "yyyy-LL-dd",
+    ];
+
+    for (const format of formats) {
+        const parsed = DateTime.fromFormat(trimmed, format, { zone });
+        if (parsed.isValid) {
+            if (format === "yyyy-LL-dd") {
+                return parsed.set({ hour: defaultHour, minute: defaultMinute, second: 0, millisecond: 0 });
+            }
+            return parsed;
+        }
+    }
+
+    const rfc2822 = DateTime.fromRFC2822(trimmed, { setZone: true });
+    if (rfc2822.isValid) {
+        return rfc2822.setZone(zone);
+    }
+
+    return null;
+}
+
 /**
  * Convertit une valeur vers un DateTime positionné sur le fuseau horaire Hugo.
  * @param {Date|import("luxon").DateTime|string|number|null} value Valeur à convertir (null : maintenant).
@@ -65,9 +116,9 @@ function toHugoDateTime(value = null) {
     }
 
     if (typeof value === "string") {
-        const parsed = DateTime.fromISO(value, { setZone: true }).setZone(zone);
-        if (!parsed.isValid) {
-            throw new Error(parsed.invalidReason || `Chaîne de date invalide : ${value}`);
+        const parsed = parseHugoDateString(value, zone);
+        if (!parsed) {
+            throw new Error(`Chaîne de date invalide : ${value}`);
         }
         return parsed;
     }
@@ -84,14 +135,14 @@ function toHugoDateTime(value = null) {
 }
 
 /**
- * Formate une date en ISO 8601 avec l'offset du fuseau horaire Hugo.
+ * Formate une date selon le format Hugo simple (sans offset).
  * @param {Date|import("luxon").DateTime|string|number|null} value Valeur à formater.
- * @returns {string} Timestamp ISO 8601 avec offset.
+ * @returns {string} Date formatée.
  */
 function formatDateTime(value = null) {
     const zoned = toHugoDateTime(value);
     const normalized = zoned.set({ millisecond: 0 });
-    const formatted = normalized.toISO({ suppressMilliseconds: true });
+    const formatted = normalized.toFormat("yyyy-LL-dd HH:mm:ss");
 
     if (!formatted) {
         throw new Error("Impossible de formater la date avec le fuseau Hugo.");
@@ -119,16 +170,8 @@ function parseFrontmatterDate(value) {
     }
 
     if (typeof value === "string") {
-        const trimmed = value.trim();
-        if (!trimmed) {
-            return null;
-        }
-        const iso = DateTime.fromISO(trimmed, { setZone: true }).setZone(zone);
-        if (iso.isValid) {
-            return iso;
-        }
-        const rfc2822 = DateTime.fromRFC2822(trimmed, { setZone: true }).setZone(zone);
-        return rfc2822.isValid ? rfc2822 : null;
+        const parsed = parseHugoDateString(value, zone);
+        return parsed;
     }
 
     if (typeof value === "number" && Number.isFinite(value)) {
diff --git a/tools/normalize_article_dates.js b/tools/normalize_article_dates.js
new file mode 100644
index 00000000..f1ce2de4
--- /dev/null
+++ b/tools/normalize_article_dates.js
@@ -0,0 +1,125 @@
+#!/usr/bin/env node
+
+const fs = require("fs/promises");
+const path = require("path");
+const {
+    extractRawDate,
+    readFrontmatter,
+    writeFrontmatter,
+} = require("./lib/weather/frontmatter");
+const { parseFrontmatterDate, formatDateTime, getHugoTimeZone } = require("./lib/datetime");
+
+const CONTENT_ROOT = path.join(process.cwd(), "content");
+
+/**
+ * Liste récursivement tous les fichiers Markdown d'un dossier.
+ * @param {string} root Dossier racine à parcourir.
+ * @returns {Promise<string[]>} Chemins absolus des fichiers trouvés.
+ */
+async function listMarkdownFiles(root) {
+    const entries = await fs.readdir(root, { withFileTypes: true });
+    const results = [];
+
+    for (const entry of entries) {
+        const fullPath = path.join(root, entry.name);
+        if (entry.isDirectory()) {
+            const nested = await listMarkdownFiles(fullPath);
+            results.push(...nested);
+            continue;
+        }
+        if (entry.isFile() && entry.name.endsWith(".md")) {
+            results.push(fullPath);
+        }
+    }
+
+    return results;
+}
+
+/**
+ * Harmonise la date d'un fichier Markdown si nécessaire.
+ * @param {string} filePath Chemin absolu du fichier.
+ * @returns {Promise<"updated"|"unchanged"|"skipped"|"invalid">} Statut de traitement.
+ */
+async function normalizeFileDate(filePath) {
+    const frontmatter = await readFrontmatter(filePath);
+    if (!frontmatter) {
+        return "skipped";
+    }
+
+    const rawDate = extractRawDate(frontmatter.frontmatterText);
+    const dateValue = frontmatter.doc.get("date");
+
+    if (!rawDate && (dateValue === undefined || dateValue === null)) {
+        return "skipped";
+    }
+
+    const sourceValue = rawDate !== null ? rawDate : dateValue;
+    const parsed = parseFrontmatterDate(sourceValue);
+    if (!parsed) {
+        return "invalid";
+    }
+
+    let hasTime = false;
+    if (typeof rawDate === "string") {
+        const timeMatch = rawDate.match(/[T ](\d{2}):(\d{2})(?::(\d{2}))?/);
+        if (timeMatch) {
+            const hour = Number(timeMatch[1]);
+            const minute = Number(timeMatch[2]);
+            const second = Number(timeMatch[3] || "0");
+            hasTime = !(hour === 0 && minute === 0 && second === 0);
+        }
+    }
+    const normalized = hasTime
+        ? parsed.set({ millisecond: 0 })
+        : parsed.set({ hour: 12, minute: 0, second: 0, millisecond: 0 });
+    const formatted = formatDateTime(normalized);
+    const current = typeof dateValue === "string" ? dateValue.trim() : rawDate;
+    const quotedFormatted = `"${formatted}"`;
+    const currentComparable = typeof current === "string" ? current.trim() : "";
+
+    if (currentComparable === formatted || currentComparable === quotedFormatted) {
+        return "unchanged";
+    }
+
+    frontmatter.doc.set("date", formatted);
+    await writeFrontmatter(filePath, frontmatter.doc, frontmatter.body);
+    const rewritten = await fs.readFile(filePath, "utf8");
+    const normalizedContent = rewritten.replace(/^date:\s*.+$/m, `date: ${quotedFormatted}`);
+    if (rewritten !== normalizedContent) {
+        await fs.writeFile(filePath, normalizedContent, "utf8");
+    }
+    return "updated";
+}
+
+/**
+ * Point d'entrée du script.
+ */
+async function main() {
+    const timezone = getHugoTimeZone();
+    console.log(`Fuseau horaire Hugo : ${timezone}`);
+
+    const files = await listMarkdownFiles(CONTENT_ROOT);
+    let updated = 0;
+    let unchanged = 0;
+    let skipped = 0;
+    let invalid = 0;
+
+    for (const file of files) {
+        const status = await normalizeFileDate(file);
+        if (status === "updated") updated += 1;
+        else if (status === "unchanged") unchanged += 1;
+        else if (status === "invalid") {
+            invalid += 1;
+            const relative = path.relative(process.cwd(), file);
+            console.warn(`Date invalide : ${relative}`);
+        } else {
+            skipped += 1;
+        }
+    }
+
+    console.log(
+        `Terminé. ${updated} mis à jour, ${unchanged} inchangés, ${skipped} ignorés, ${invalid} invalides.`
+    );
+}
+
+main();