1. Create diary entry by day. The diary is plain text. 2. If diary is modified, it will be saved when openJDiary is closed. 3. Use menu or Ctrl+S can save diary. 4. Use menu or Ctrl+W can closed diary when more than two is opened. 5. Use menu or Ctrl+Q can closed openJDiary. 6. You can open and edit any diary that is created by you. 7. When you select arithmetic express and press F12 key, you can get the summation. And you can use menu to do this. 8. You can change config.xml to modify font and tab size of diary. 9. openJDiary UI is i18n. And now you can use English and Chinese.