diff --git a/src/main/java/com/uid2/admin/vertx/service/ClientKeyService.java b/src/main/java/com/uid2/admin/vertx/service/ClientKeyService.java
index e13aa3d9..72e9ab67 100644
--- a/src/main/java/com/uid2/admin/vertx/service/ClientKeyService.java
+++ b/src/main/java/com/uid2/admin/vertx/service/ClientKeyService.java
@@ -258,7 +258,7 @@ private static JsonObject createClientKeyJsonObject(LegacyClientKey clientKey) {
         returnObject.put("name", clientKey.getName());
         returnObject.put("contact", clientKey.getContact());
         returnObject.put("roles", RequestUtil.getRolesSpec(clientKey.getRoles()));
-        returnObject.put("created", clientKey.getCreated());
+        returnObject.put("created", clientKey.getCreated() * 1000L); // convert creation timestamp from seconds to milliseconds for JSON display
         returnObject.put("site_id", clientKey.getSiteId());
         returnObject.put("disabled", clientKey.isDisabled());
         returnObject.put("service_id", clientKey.getServiceId());