No more outdated snapshots! You can now import or, even better, subscribe to the actual content of the Planner calendar from your own favorite calendar application (Outlook, Google, iPhone/iPad)
To view the calendar in a browser:
To import or subscribe to the calendar:
Guidelines for subscribing:
See for example the guide Import or subscribe to a calendar in Outlook on the web on Microsoft Office support site.
With Google Calendar open, on the left hand side under other calendars, select Add a new calendar and then Add from URL and paste in the address above to create a new calendar with a subscription from the Planner
You can find numerous guidelines by searching the web for How to subscribe to calendars on iPhone and iPad