This message occurs if the installed version of the worldwide holidays database is a year old, or more.
➢To see the most recent changes included in the update on the web, you can go to the release notes web page.
You can see which version of the worldwide holidays database is installed at the bottom of the About dialog.
Solution
You should update your database of worldwide public holidays (this only updates the public holidays located inside the Q++Studio Samples folder of the holidays manager, and does not affect your own holidays).
Topic 177965, last updated on 22-Mar-2021