diff --git a/src/constants.js b/src/constants.js
index 6382690..1c29ef3 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -1,3 +1,6 @@
+import { getTimestampInSeconds } from "./helpers";
+
+export const MIGRATE_VERSION = '2.0.0';
 export const DEFAULT_DICTIONARY = {
   name: 'New',
   specification: 'Dictionary',
@@ -47,7 +50,8 @@ export const DEFAULT_DICTIONARY = {
     isPublic: false,
   },
   lastUpdated: null,
-  createdOn: 0,
+  createdOn: getTimestampInSeconds(),
+  version: MIGRATE_VERSION,
 };
 
 export const DEFAULT_PAGE_SIZE = 50;
diff --git a/src/helpers.js b/src/helpers.js
index e1a13be..c85e288 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -4,6 +4,28 @@ export function cloneObject(object) {
   return JSON.parse(JSON.stringify(object));
 }
 
+export function getIndicesOf(searchStr, findIn, caseSensitive) {
+  // https://stackoverflow.com/a/3410557
+  const searchStrLen = searchStr.length;
+  if (searchStrLen == 0) {
+    return [];
+  }
+  let startIndex = 0, index, indices = [];
+  if (!caseSensitive) {
+    findIn = findIn.toLowerCase();
+    searchStr = searchStr.toLowerCase();
+  }
+  while ((index = findIn.indexOf(searchStr, startIndex)) > -1) {
+    indices.push(index);
+    startIndex = index + searchStrLen;
+  }
+  return indices;
+}
+
+export function getTimestampInSeconds() {
+  return Math.round(Date.now() / 1000);
+}
+
 export function removeTags(html) {
   if (html) {
     var tagBody = '(?:[^"\'>]|"[^"]*"|\'[^\']*\')*';
@@ -32,21 +54,3 @@ export function removeTags(html) {
 export function slugify(string) {
   return removeDiacritics(string).replace(/[!a-zA-Z0-9-_]/g, '-');
 }
-
-export function getIndicesOf(searchStr, findIn, caseSensitive) {
-  // https://stackoverflow.com/a/3410557
-  const searchStrLen = searchStr.length;
-  if (searchStrLen == 0) {
-    return [];
-  }
-  let startIndex = 0, index, indices = [];
-  if (!caseSensitive) {
-    findIn = findIn.toLowerCase();
-    searchStr = searchStr.toLowerCase();
-  }
-  while ((index = findIn.indexOf(searchStr, startIndex)) > -1) {
-    indices.push(index);
-    startIndex = index + searchStrLen;
-  }
-  return indices;
-}
diff --git a/src/js/dictionaryManagement.js b/src/js/dictionaryManagement.js
index c49b77f..732e0f6 100644
--- a/src/js/dictionaryManagement.js
+++ b/src/js/dictionaryManagement.js
@@ -1,5 +1,5 @@
 import { renderDictionaryDetails, renderPartsOfSpeech } from "./render";
-import { removeTags, cloneObject } from "../helpers";
+import { removeTags, cloneObject, getTimestampInSeconds } from "../helpers";
 import { LOCAL_STORAGE_KEY, DEFAULT_DICTIONARY } from "../constants";
 
 export function updateDictionary () {
@@ -73,6 +73,7 @@ export function saveAndCloseEditModal() {
 }
 
 export function saveDictionary() {
+  window.currentDictionary.lastUpdated = getTimestampInSeconds();
   window.localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(window.currentDictionary));
 }