145 International Days are observed by the United Nations according to their website This project will provide the complete set in a format which can be imported into generic calendar applications.
You can directly import the calendar file from Github by using the URL for the ics-file (raw version): https://github.com/civilianEU/un-international-days/raw/master/un-international-days.ics
In some applications, you might need to replace https with webcal.
Feel free to create a pull request to include additional details or missing International Days.
Pull requests should pass a validator test without warnings or errors and should only include events / information found in authorative UN sources. Please include references if a source other than the UN overview of International Days is used.
It would be especially good to have a description including a reference to the respective resolutions.