In case you missed it, here is a step by step guide from the video:
  1. Click "Insert" and "Date/Time..."
  2. Choose your the "Date Format"
  3. Choose whether to have an automatic offset by ticking the "Add/Subtract" checkbox
  4. Adjust the "Unit Type" and "Time Period" if required
  5. Click "OK" to insert
  6. Move, resize and change the font as required