diff --git a/src/auth/serializer/src/types.js b/src/auth/serializer/src/types.js
index f76bcea0..81a8ecc9 100644
--- a/src/auth/serializer/src/types.js
+++ b/src/auth/serializer/src/types.js
@@ -405,8 +405,8 @@ Types.time_point_sec = {
         if(typeof object !== "string")
             throw new Error("Unknown date type: " + object)
 
-        // if(typeof object === "string" && !/Z$/.test(object))
-        //     object = object + "Z"
+        if(typeof object === "string" && !/Z$/.test(object))
+            object = object + "Z"
 
         return Math.floor( new Date(object).getTime() / 1000 );
     },
diff --git a/test/all_types.js b/test/all_types.js
index 965f6c4e..3a69caea 100644
--- a/test/all_types.js
+++ b/test/all_types.js
@@ -34,6 +34,7 @@ let AllTypes = new Serilizer("all_types", {
     time_optional: optional( time_point_sec ),
     time_point_sec1: time_point_sec,
     time_point_sec2: time_point_sec,
+    time_point_sec3: time_point_sec,
 })
 
 // Must stay in sync with AllTypes above.
@@ -59,6 +60,7 @@ let allTypes = {
     time_optional: undefined,
     time_point_sec1: new Date(),
     time_point_sec2: Math.floor(Date.now()/1000),
+    time_point_sec3: '2017-02-16T20:27:12',
 }
 
 describe("all types", ()=> {