‘dd-mm-jjjj’ is not a valid date

The date format in the Diamonds.ini file is incorrect:

1. Close Diamonds.
2. Go to ‘My Documents’ > ‘Diamonds’ folder
3. Double click the file ‘Diamonds.ini’ to open it (if file extensions are not visible, the file is simply called ‘Diamonds’)
4. Change the date format in the upper 5 lines into dd/mm/jjjj
5. Save and close this file
6. Launch Diamonds