Fix multiline strings and date formatting patterns

Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com>

Author: Copilot

data/snippets.json

@@ -45,7 +45,7 @@
     "oldApproach": "String Concatenation",
     "modernApproach": "Text Blocks",
     "oldCode": "String json = \"{\\n\" +\n    \"  \\\"name\\\": \\\"Duke\\\",\\n\" +\n    \"  \\\"age\\\": 30\\n\" +\n    \"}\";",
-    "modernCode": "String json = \"\"\"\n    {\n      \"name\": \"Duke\",\n      \"age\": 30\n    }\n    \"\"\";",
+    "modernCode": "String json = \"\"\"\n    {\n      \"name\": \"Duke\",\n      \"age\": 30\n    }\"\"\";",
     "summary": "Write multiline strings naturally with triple-quote text blocks.",
     "explanation": "Text blocks let you write multiline strings exactly as they appear. No more escaping quotes or adding \\n. The compiler strips incidental indentation automatically.",
     "whyModernWins": [
@@ -1133,7 +1133,7 @@
     "oldApproach": "Escaped Strings",
     "modernApproach": "Text Blocks",
     "oldCode": "String sql =\n    \"SELECT u.name, u.email\\n\" +\n    \"FROM users u\\n\" +\n    \"WHERE u.active = true\\n\" +\n    \"ORDER BY u.name\";",
-    "modernCode": "String sql = \"\"\"\n    SELECT u.name, u.email\n    FROM users u\n    WHERE u.active = true\n    ORDER BY u.name\n    \"\"\";",
+    "modernCode": "String sql = \"\"\"\n    SELECT u.name, u.email\n    FROM users u\n    WHERE u.active = true\n    ORDER BY u.name\"\"\";",
     "summary": "Write SQL, JSON, and HTML as they actually look.",
     "explanation": "Text blocks make embedded languages readable. Copy SQL from your database tool and paste it directly. The closing delimiter position controls indentation stripping.",
     "whyModernWins": [
@@ -2424,8 +2424,8 @@
     "modernLabel": "Java 8+",
     "oldApproach": "SimpleDateFormat",
     "modernApproach": "DateTimeFormatter",
-    "oldCode": "// Not thread-safe!\nSimpleDateFormat sdf =\n    new SimpleDateFormat(\"yyyy-MM-dd\");\nString formatted = sdf.format(date);\n// Must synchronize for concurrent use",
-    "modernCode": "DateTimeFormatter fmt =\n    DateTimeFormatter.ofPattern(\n        \"yyyy-MM-dd\");\nString formatted =\n    LocalDate.now().format(fmt);\n// Thread-safe, immutable",
+    "oldCode": "// Not thread-safe!\nSimpleDateFormat sdf =\n    new SimpleDateFormat(\"uuuu-MM-dd\");\nString formatted = sdf.format(date);\n// Must synchronize for concurrent use",
+    "modernCode": "DateTimeFormatter fmt =\n    DateTimeFormatter.ofPattern(\n        \"uuuu-MM-dd\");\nString formatted =\n    LocalDate.now().format(fmt);\n// Thread-safe, immutable",
     "summary": "Format dates with thread-safe, immutable DateTimeFormatter.",
     "explanation": "DateTimeFormatter is immutable and thread-safe, unlike SimpleDateFormat. It can be stored as a constant and shared. Predefined formatters like ISO_LOCAL_DATE are available for common formats.",
     "whyModernWins": [

date-formatting.html

@@ -125,7 +125,7 @@ <h1>Date formatting</h1>
           <div class="compare-code">
             <pre class="code-text">// Not thread-safe!
 SimpleDateFormat sdf =
-    new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
+    new SimpleDateFormat(&quot;uuuu-MM-dd&quot;);
 String formatted = sdf.format(date);
 // Must synchronize for concurrent use</pre>
           </div>
@@ -138,7 +138,7 @@ <h1>Date formatting</h1>
           <div class="compare-code">
             <pre class="code-text">DateTimeFormatter fmt =
     DateTimeFormatter.ofPattern(
-        &quot;yyyy-MM-dd&quot;);
+        &quot;uuuu-MM-dd&quot;);
 String formatted =
     LocalDate.now().format(fmt);
 // Thread-safe, immutable</pre>

duration-and-period.html

@@ -254,15 +254,15 @@ <h3>Date formatting</h3>
               <div class="mini-label">Pre-Java 8</div>
               <pre class="code-text">// Not thread-safe!
 SimpleDateFormat sdf =
-    new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
+    new SimpleDateFormat(&quot;uuuu-MM-dd&quot;);
 String formatted = sdf.format(date);
 // Must synchronize for concurrent use</pre>
             </div>
             <div class="card-code-layer modern-layer">
               <div class="mini-label">Java 8+</div>
               <pre class="code-text">DateTimeFormatter fmt =
     DateTimeFormatter.ofPattern(
-        &quot;yyyy-MM-dd&quot;);
+        &quot;uuuu-MM-dd&quot;);
 String formatted =
     LocalDate.now().format(fmt);
 // Thread-safe, immutable</pre>

hex-format.html

@@ -220,15 +220,15 @@ <h3>Date formatting</h3>
               <div class="mini-label">Pre-Java 8</div>
               <pre class="code-text">// Not thread-safe!
 SimpleDateFormat sdf =
-    new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
+    new SimpleDateFormat(&quot;uuuu-MM-dd&quot;);
 String formatted = sdf.format(date);
 // Must synchronize for concurrent use</pre>
             </div>
             <div class="card-code-layer modern-layer">
               <div class="mini-label">Java 8+</div>
               <pre class="code-text">DateTimeFormatter fmt =
     DateTimeFormatter.ofPattern(
-        &quot;yyyy-MM-dd&quot;);
+        &quot;uuuu-MM-dd&quot;);
 String formatted =
     LocalDate.now().format(fmt);
 // Thread-safe, immutable</pre>

index.html

@@ -2516,15 +2516,15 @@ <h3>Date formatting</h3>
             <span class="mini-label">Old</span>
             <span class="code-text">// Not thread-safe!
 SimpleDateFormat sdf =
-    new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
+    new SimpleDateFormat(&quot;uuuu-MM-dd&quot;);
 String formatted = sdf.format(date);
 // Must synchronize for concurrent use</span>
           </div>
           <div class="card-code-layer modern-layer">
             <span class="mini-label">Modern</span>
             <span class="code-text">DateTimeFormatter fmt =
     DateTimeFormatter.ofPattern(
-        &quot;yyyy-MM-dd&quot;);
+        &quot;uuuu-MM-dd&quot;);
 String formatted =
     LocalDate.now().format(fmt);
 // Thread-safe, immutable</span>

java-time-basics.html

@@ -286,15 +286,15 @@ <h3>Date formatting</h3>
               <div class="mini-label">Pre-Java 8</div>
               <pre class="code-text">// Not thread-safe!
 SimpleDateFormat sdf =
-    new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
+    new SimpleDateFormat(&quot;uuuu-MM-dd&quot;);
 String formatted = sdf.format(date);
 // Must synchronize for concurrent use</pre>
             </div>
             <div class="card-code-layer modern-layer">
               <div class="mini-label">Java 8+</div>
               <pre class="code-text">DateTimeFormatter fmt =
     DateTimeFormatter.ofPattern(
-        &quot;yyyy-MM-dd&quot;);
+        &quot;uuuu-MM-dd&quot;);
 String formatted =
     LocalDate.now().format(fmt);
 // Thread-safe, immutable</pre>

multiline-json-sql.html

@@ -140,8 +140,7 @@ <h1>Multiline JSON/SQL/HTML</h1>
     SELECT u.name, u.email
     FROM users u
     WHERE u.active = true
-    ORDER BY u.name
-    &quot;&quot;&quot;;</pre>
+    ORDER BY u.name&quot;&quot;&quot;;</pre>
           </div>
         </div>
       </div>

text-blocks-for-multiline-strings.html

@@ -139,8 +139,7 @@ <h1>Text blocks for multiline strings</h1>
     {
       &quot;name&quot;: &quot;Duke&quot;,
       &quot;age&quot;: 30
-    }
-    &quot;&quot;&quot;;</pre>
+    }&quot;&quot;&quot;;</pre>
           </div>
         </div>
       </div>