If the native app does not support CalDAV directly, you can download a third-party app and use the CalDAV server URL: https://caldav.calendar.yahoo.com . Troubleshooting & Tips
View your appointments without an internet connection. download yahoo calendar
Note: This creates a one-time snapshot of your events. Future changes to your Yahoo Calendar will not automatically update this downloaded file. If the native app does not support CalDAV
Copy the URL listed under "To import into a Calendar app (ICS)". download yahoo calendar