diff --git a/src/index.html b/src/index.html
index 009e796..e19ac3f 100644
--- a/src/index.html
+++ b/src/index.html
@@ -54,9 +54,11 @@
             <option value="rfc9278-s256">JWK Thumbprint URI (SHA-256)</option>
             <option value="rfc9278-s384">JWK Thumbprint URI (SHA-384)</option>
             <option value="rfc9278-s512">JWK Thumbprint URI (SHA-512)</option>
-            <option value="date-time">Date and Time</option>
             <option value="uuid">UUID</option>
             <option value="uuid-uri">UUID URI</option>
+            <option value="unix-timestamp">Timestamp</option>
+            <option value="ecma-timestamp">Timestamp (milliseconds)</option>
+            <option value="date-time">Date and Time</option>
             <option value="">-</option>
           </select>
         </label>
diff --git a/src/main.ts b/src/main.ts
index cddac1c..a6894fc 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -26,9 +26,11 @@ async function onSubmit(e: SubmitEvent) {
     "rfc9278-s256": () => calculateJwkThumbprintUri(jwk, "sha256"),
     "rfc9278-s384": () => calculateJwkThumbprintUri(jwk, "sha384"),
     "rfc9278-s512": () => calculateJwkThumbprintUri(jwk, "sha512"),
-    "date-time": () => new Date().toISOString(),
     uuid: () => crypto.randomUUID(),
     "uuid-uri": () => `urn:uuid:${crypto.randomUUID()}`,
+    "unix-timestamp": () => String(Math.floor(new Date().getTime() / 1_000)),
+    "ecma-timestamp": () => String(new Date().getTime()),
+    "date-time": () => new Date().toISOString(),
   }[data.get("kid-method") as string];
   const kid = await createKid?.();
   privateKeyOutput.textContent = JSON.stringify(