diff --git a/lib/extension/networkMap.js b/lib/extension/networkMap.js
index cd8de63b..efb69e2d 100644
--- a/lib/extension/networkMap.js
+++ b/lib/extension/networkMap.js
@@ -74,11 +74,10 @@ class NetworkMap extends BaseExtension {
             let lastSeen = 'unknown';
             const date = device.type === 'Coordinator' ? Date.now() : device.lastSeen;
             if (date) {
-                const lastSeenAgo = `${new Date(Date.now() - date).toISOString().substr(11, 8)}s ago`;
-                lastSeen = utils.formatDate(date, settings.get().advanced.last_seen, lastSeenAgo);
+                lastSeen = utils.formatDate(date, 'ISO_8601_local', null);
             }
 
-            labels.push(`Last seen: ${lastSeen}`);
+            labels.push(lastSeen);
 
             // Shape the record according to device type
             if (device.type == 'Coordinator') {
diff --git a/test/networkMap.test.js b/test/networkMap.test.js
index c7bd2b5d..b09ff2f6 100644
--- a/test/networkMap.test.js
+++ b/test/networkMap.test.js
@@ -142,16 +142,16 @@ describe('Networkmap', () => {
 
         const expected = `digraph G {
             node[shape=record];
-              "0x00124b00120144ae" [style="bold, filled", fillcolor="#e04e5d", fontcolor="#ffffff", label="{Coordinator|0x00124b00120144ae (0)|Last seen: 00:00:00s ago}"];
-              "0x000b57fffec6a5b2" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{bulb|0x000b57fffec6a5b2 (40369)|IKEA TRADFRI LED bulb E26/E27 980 lumen, dimmable, white spectrum, opal white (LED1545G12)|Last seen: 00:00:09s ago}"];
+              "0x00124b00120144ae" [style="bold, filled", fillcolor="#e04e5d", fontcolor="#ffffff", label="{Coordinator|0x00124b00120144ae (0)|1970-01-01T01:00:10+01:00}"];
+              "0x000b57fffec6a5b2" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{bulb|0x000b57fffec6a5b2 (40369)|IKEA TRADFRI LED bulb E26/E27 980 lumen, dimmable, white spectrum, opal white (LED1545G12)|1970-01-01T01:00:01+01:00}"];
               "0x000b57fffec6a5b2" -> "0x00124b00120144ae" [penwidth=2, weight=1, color="#009900", label="92 (routes: 6540)"]
-              "0x000b57fffec6a5b3" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{bulb_color|0x000b57fffec6a5b3 (40399)|Philips Hue Go (7146060PH)|Last seen: unknown}"];
+              "0x000b57fffec6a5b3" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{bulb_color|0x000b57fffec6a5b3 (40399)|Philips Hue Go (7146060PH)|unknown}"];
               "0x000b57fffec6a5b3" -> "0x00124b00120144ae" [penwidth=0.5, weight=0, color="#994444", label="120"]
               "0x000b57fffec6a5b3" -> "0x000b57fffec6a5b2" [penwidth=0.5, weight=0, color="#994444", label="110"]
-              "0x0017880104e45521" [style="rounded, dashed, filled", fillcolor="#fff8ce", fontcolor="#000000", label="{button_double_key|0x0017880104e45521 (6538)|Xiaomi Aqara double key wireless wall switch (WXKG02LM)|Last seen: 00:00:09s ago}"];
+              "0x0017880104e45521" [style="rounded, dashed, filled", fillcolor="#fff8ce", fontcolor="#000000", label="{button_double_key|0x0017880104e45521 (6538)|Xiaomi Aqara double key wireless wall switch (WXKG02LM)|1970-01-01T01:00:01+01:00}"];
               "0x0017880104e45521" -> "0x0017880104e45559" [penwidth=1, weight=0, color="#994444", label="130"]
-              "0x0017880104e45525" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{0x0017880104e45525|0x0017880104e45525 (6536)failed: lqi,routingTable|Boef notSupportedModelID|Last seen: 00:00:09s ago}"];
-              "0x0017880104e45559" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{cc2530_router|0x0017880104e45559 (6540)|Custom devices (DiY) [CC2530 router](http://ptvo.info/cc2530-based-zigbee-coordinator-and-router-112/) (CC2530.ROUTER)|Last seen: 00:00:09s ago}"];
+              "0x0017880104e45525" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{0x0017880104e45525|0x0017880104e45525 (6536)failed: lqi,routingTable|Boef notSupportedModelID|1970-01-01T01:00:01+01:00}"];
+              "0x0017880104e45559" [style="rounded, filled", fillcolor="#4ea3e0", fontcolor="#ffffff", label="{cc2530_router|0x0017880104e45559 (6540)|Custom devices (DiY) [CC2530 router](http://ptvo.info/cc2530-based-zigbee-coordinator-and-router-112/) (CC2530.ROUTER)|1970-01-01T01:00:01+01:00}"];
               "0x0017880104e45559" -> "0x000b57fffec6a5b2" [penwidth=0.5, weight=0, color="#994444", label="100"]
             }`;