In the OpenURL table in the Customization Manager, most people have a PhotoJournalYear under the ILLiadFieldName column header. They also set up the ILLiadValue to be:
DATE|yyyy
This feature breaks out the year. This process helps sites that are processing Copyright and the year shows up correctly when you go to the Awaiting Copyright Processing.
If you want to have one for PhotoJournalMonth here are the steps you need to take: