diff --git a/src/popup/views/addressDetail.js b/src/popup/views/addressDetail.js
index fd28e96..3f2ae3f 100644
--- a/src/popup/views/addressDetail.js
+++ b/src/popup/views/addressDetail.js
@@ -95,6 +95,10 @@ function show() {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
+    const off = -d.getTimezoneOffset();
+    const sign = off >= 0 ? "+" : "-";
+    const absOff = Math.abs(off);
+    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
     return (
         d.getFullYear() +
         "-" +
@@ -106,7 +110,8 @@ function isoDate(timestamp) {
         ":" +
         pad(d.getMinutes()) +
         ":" +
-        pad(d.getSeconds())
+        pad(d.getSeconds()) +
+        tz
     );
 }
 
diff --git a/src/popup/views/addressToken.js b/src/popup/views/addressToken.js
index b0e926b..968ace9 100644
--- a/src/popup/views/addressToken.js
+++ b/src/popup/views/addressToken.js
@@ -48,6 +48,10 @@ function etherscanAddressLink(address) {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
+    const off = -d.getTimezoneOffset();
+    const sign = off >= 0 ? "+" : "-";
+    const absOff = Math.abs(off);
+    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
     return (
         d.getFullYear() +
         "-" +
@@ -59,7 +63,8 @@ function isoDate(timestamp) {
         ":" +
         pad(d.getMinutes()) +
         ":" +
-        pad(d.getSeconds())
+        pad(d.getSeconds()) +
+        tz
     );
 }
 
diff --git a/src/popup/views/helpers.js b/src/popup/views/helpers.js
index 45329ea..95e6363 100644
--- a/src/popup/views/helpers.js
+++ b/src/popup/views/helpers.js
@@ -226,6 +226,10 @@ function formatAddressHtml(address, ensName, maxLen, title) {
 function isoDate(timestamp) {
     const d = new Date(timestamp * 1000);
     const pad = (n) => String(n).padStart(2, "0");
+    const off = -d.getTimezoneOffset();
+    const sign = off >= 0 ? "+" : "-";
+    const absOff = Math.abs(off);
+    const tz = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
     return (
         d.getFullYear() +
         "-" +
@@ -237,7 +241,8 @@ function isoDate(timestamp) {
         ":" +
         pad(d.getMinutes()) +
         ":" +
-        pad(d.getSeconds())
+        pad(d.getSeconds()) +
+        tz
     );
 }
 
diff --git a/src/shared/uniswap.js b/src/shared/uniswap.js
index 1374477..e236514 100644
--- a/src/shared/uniswap.js
+++ b/src/shared/uniswap.js
@@ -487,7 +487,10 @@ function decode(data, toAddress) {
         const deadlineDate = new Date(Number(deadline) * 1000);
         details.push({
             label: "Deadline",
-            value: deadlineDate.toISOString().replace("T", " ").slice(0, 19),
+            value: deadlineDate
+                .toISOString()
+                .replace("T", " ")
+                .replace(".000Z", "Z"),
         });
 
         return {