diff -r 7e8cdc74d86f -r 043477fd5c5c client/src/components/SlateEditor.js
--- a/client/src/components/SlateEditor.js	Thu Jun 22 11:58:27 2017 +0200
+++ b/client/src/components/SlateEditor.js	Thu Jun 22 12:09:48 2017 +0200
@@ -2,11 +2,11 @@
 import React from 'react'
 import Portal from 'react-portal'
 import { Button } from 'react-bootstrap'
-import moment from 'moment'
 import Immutable from 'immutable'
 import HtmlSerializer from '../HtmlSerializer'
 import AnnotationPlugin from '../AnnotationPlugin'
 import CategoriesTooltip from './CategoriesTooltip'
+import { now } from '../utils';
 
 const plugins = [];
 
@@ -143,12 +143,12 @@
         finishedAt: null
       });
     } else {
-      Object.assign(newState, { finishedAt: moment().format('H:mm:ss') });
+      Object.assign(newState, { finishedAt: now() });
     }
 
     // Store start time once when the first character is typed
     if (!isEmpty && this.state.startedAt === null) {
-      Object.assign(newState, { startedAt: moment().format('H:mm:ss') });
+      Object.assign(newState, { startedAt: now() });
     }
 
     this.setState(newState)