diff --git a/frontend/index.html b/frontend/index.html
index f21df42..d2a1c6b 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -372,6 +372,7 @@ const STATE = {
     currentSessionId: null,
     currentSessionName: null,
     sessionViewId: null,
+    sessionStarted: null,
     livePoller: null,
     messages: [],
     typeCounts: [],
@@ -467,6 +468,23 @@ function fmt_elapsed(e) {
     return `${String(s).padStart(4, '0')}.${String(ms).padStart(3, '0')}`;
 }
 
+function fmt_absolute(e) {
+    // Absolute wall-clock time of a message: session/capture start
+    // (sessions.started, local time) + message elapsed offset.
+    if (!STATE.sessionStarted) return null;
+    const t = new Date(STATE.sessionStarted);
+    if (isNaN(t)) return null;
+    t.setMilliseconds(t.getMilliseconds() + Math.round(e * 1000));
+    const p = (n, w) => String(n).padStart(w || 2, '0');
+    return `${t.getFullYear()}-${p(t.getMonth() + 1)}-${p(t.getDate())} ` +
+        `${p(t.getHours())}:${p(t.getMinutes())}:${p(t.getSeconds())}.${p(t.getMilliseconds(), 3)}`;
+}
+
+function detail_time_html(msg) {
+    const abs = fmt_absolute(msg.elapsed);
+    return abs ? `${fmt_elapsed(msg.elapsed)} · ${abs}` : fmt_elapsed(msg.elapsed);
+}
+
 function fmt_data(hex, limit) {
     limit = limit || 32;
     const pairs = (hex || '').match(/.{1,2}/g) || [];
@@ -920,19 +938,19 @@ function showDetail(msg, entry) {
     const decoded = msg.decoded;
 
     if (msg.type === 'gap') {
-        d.innerHTML = `<div class="detail-header"><strong>Capture Gap</strong><span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span></div>
+        d.innerHTML = `<div class="detail-header"><strong>Capture Gap</strong><span style="color:var(--text-muted)">${detail_time_html(msg)}</span></div>
             <div class="detail-body" style="color:var(--warn);">⚠ ${t('The device disconnected and reconnected — some APDUs may be missing from this trace.')}</div>`;
         return;
     }
 
     if (!decoded) {
-        d.innerHTML = `<div class="detail-header"><strong>${ins_label(msg)}</strong><span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span></div>
+        d.innerHTML = `<div class="detail-header"><strong>${ins_label(msg)}</strong><span style="color:var(--text-muted)">${detail_time_html(msg)}</span></div>
             <div class="detail-body" style="color:var(--text-muted);">No decoded data available for this message type.</div>`;
         return;
     }
 
     if (decoded.type === 'change') {
-        d.innerHTML = `<div class="detail-header"><strong>State Change</strong><span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span></div>
+        d.innerHTML = `<div class="detail-header"><strong>State Change</strong><span style="color:var(--text-muted)">${detail_time_html(msg)}</span></div>
             <div class="detail-body">
                 <table>
                     <tr><td class="label">Flags</td><td class="value">${decoded.flags.join(', ') || 'no changes'}</td></tr>
@@ -942,7 +960,7 @@ function showDetail(msg, entry) {
     }
 
     if (decoded.type === 'fidi') {
-        d.innerHTML = `<div class="detail-header"><strong>Fi/Di Change</strong><span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span></div>
+        d.innerHTML = `<div class="detail-header"><strong>Fi/Di Change</strong><span style="color:var(--text-muted)">${detail_time_html(msg)}</span></div>
             <div class="detail-body">
                 <table>
                     <tr><td class="label">Fi</td><td class="value">${decoded.fi_val} (index ${decoded.fi})</td></tr>
@@ -955,7 +973,7 @@ function showDetail(msg, entry) {
 
     if (decoded.type === 'atr' || decoded.type === 'pps') {
         const rows = atrPpsRows(decoded);
-        d.innerHTML = `<div class="detail-header"><strong>${decoded.type.toUpperCase()}</strong><span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span></div>
+        d.innerHTML = `<div class="detail-header"><strong>${decoded.type.toUpperCase()}</strong><span style="color:var(--text-muted)">${detail_time_html(msg)}</span></div>
             <div class="detail-body">
                 <table>
                     ${rows.map(([l, v]) => `<tr><td class="label">${l}</td><td class="hex">${v}</td></tr>`).join('')}
@@ -1024,7 +1042,7 @@ function showDetail(msg, entry) {
 
     d.innerHTML = `<div class="detail-header">
         <strong>${decoded.cat_command || decoded.ins_name}</strong>
-        <span style="color:var(--text-muted)">${fmt_elapsed(msg.elapsed)}</span>
+        <span style="color:var(--text-muted)">${detail_time_html(msg)}</span>
     </div>
     <div class="detail-body">
         <table>
@@ -1466,6 +1484,7 @@ async function startCapture() {
         const data = await API.startCapture();
         STATE.captureActive = true;
         STATE.currentSessionId = data.session_id;
+        STATE.sessionStarted = data.started;
         STATE.messages = [];
         _lastAfter = 0;
         STATE.mapExpanded.clear();
@@ -1623,6 +1642,7 @@ async function loadSession(id) {
 
         const data = await API.getSession(id, 0);
         STATE.sessionViewId = id;
+        STATE.sessionStarted = data.session.started;
         STATE.captureActive = false;
         STATE.currentSessionName = data.session.name || t('Session #') + id;
         STATE.messages = data.messages;
@@ -1881,7 +1901,7 @@ function onFilterChange() {
 }
 
 // ──────────────────── Versioning ────────────────────
-const PWA_VERSION = '1.16.1';
+const PWA_VERSION = '1.17.0';
 const MIN_SERVER_VERSION = '1.0.0';
 
 function parseVersion(v) {
diff --git a/frontend/sw.js b/frontend/sw.js
index f6ba6c8..d4faf00 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v23';
+const CACHE = 'simtrace-analyser-v24';
 
 const PRECACHE = [
     'index.html',
diff --git a/pyproject.toml b/pyproject.toml
index 5c5de61..3c7f5a6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.backends._legacy:_Backend"
 
 [project]
 name = "simtrace2-pysniff"
-version = "1.16.1"
+version = "1.17.0"
 description = "Python-based sniffing tool for SIMtrace2 hardware (SIM card communication sniffer)"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {text = "GPL-2.0-or-later"}
diff --git a/simtrace2_pysniff/__init__.py b/simtrace2_pysniff/__init__.py
index 5b297ff..9790553 100644
--- a/simtrace2_pysniff/__init__.py
+++ b/simtrace2_pysniff/__init__.py
@@ -6,7 +6,7 @@ from .gsmtap import GsmtapSender, GsmtapReceiver
 from .pcap import PcapWriter
 from .dump import FileDumper, format_message
 
-__version__ = '1.16.1'
+__version__ = '1.17.0'
 __all__ = [
     'SniffSession',
     'DeviceDisconnected',
diff --git a/tests/test_pcap_import.py b/tests/test_pcap_import.py
index d5df490..7e5ab53 100644
--- a/tests/test_pcap_import.py
+++ b/tests/test_pcap_import.py
@@ -197,7 +197,7 @@ class TestImportEndpoint(unittest.TestCase):
 class TestVersion(unittest.TestCase):
     def test_package_version(self):
         from simtrace2_pysniff import __version__
-        self.assertEqual(__version__, '1.16.1')
+        self.assertEqual(__version__, '1.17.0')
 
     def test_status_includes_version(self):
         import os