diff --git a/app/assets/javascripts/app/lib/app_post/utils.coffee b/app/assets/javascripts/app/lib/app_post/utils.coffee
index 400025117..2288bd41e 100644
--- a/app/assets/javascripts/app/lib/app_post/utils.coffee
+++ b/app/assets/javascripts/app/lib/app_post/utils.coffee
@@ -709,16 +709,29 @@ class App.Utils
       key = key.replace(/<.+?>/g, '')
       levels  = key.split(/\./)
       dataRef = objects
+      dataRefLast = undefined
       for level in levels
-        if level of dataRef
+        if typeof dataRef is 'object' && level of dataRef
+          dataRefLast = dataRef
           dataRef = dataRef[level]
         else
           dataRef = ''
           break
+      value = undefined
       if typeof dataRef is 'function'
         value = dataRef()
       else if dataRef isnt undefined && dataRef isnt null && dataRef.toString
-        value = dataRef.toString()
+        if dataRefLast && dataRefLast.constructor && dataRefLast.constructor.className
+          localClassRef = App[dataRefLast.constructor.className]
+          if localClassRef && localClassRef.attributesGet
+            attributes = localClassRef.attributesGet()
+            if attributes && attributes[level]
+              if attributes[level]['tag'] is 'datetime'
+                value = App.i18n.translateTimestamp(dataRef)
+              else if attributes[level]['tag'] is 'date'
+                value = App.i18n.translateDate(dataRef)
+        if !value
+          value = dataRef.toString()
       else
         value = ''
       #console.log( "tag replacement #{key}, #{value} env: ", objects)
diff --git a/public/assets/tests/html_utils.js b/public/assets/tests/html_utils.js
index 4b7f9f3c5..f58d85797 100644
--- a/public/assets/tests/html_utils.js
+++ b/public/assets/tests/html_utils.js
@@ -1246,7 +1246,7 @@ test("identify signature by HTML", function() {
 });
 
 // check attachment references
-test("check replace tags", function() {
+test("check check attachment reference", function() {
   var message = 'some not existing'
   var result = false
   var verify = App.Utils.checkAttachmentReference(message)
@@ -1392,6 +1392,35 @@ test("check replace tags", function() {
   }
   verify = App.Utils.replaceTags(message, data)
   equal(verify, result)
+
+  user = new App.User({
+    firstname: 'Bob',
+    lastname: 'Smith',
+    created_at: '2018-10-31T10:00:00Z',
+  })
+  message = "<div>#{user.firstname} #{user.created_at}</div>"
+  result  = '<div>Bob 10/31/2018 10:00</div>'
+  data    = {
+    user: user
+  }
+  verify = App.Utils.replaceTags(message, data)
+  equal(verify, result)
+
+  message = "<div>#{user.firstname} #{user.created_at.date}</div>"
+  result  = '<div>Bob -</div>'
+  data    = {
+    user: user
+  }
+  verify = App.Utils.replaceTags(message, data)
+  equal(verify, result)
+
+  message = "<div>#{user.firstname} #{user.created.date}</div>"
+  result  = '<div>Bob -</div>'
+  data    = {
+    user: user
+  }
+  verify = App.Utils.replaceTags(message, data)
+  equal(verify, result)
 });
 
 // check attibute validation