Knowledgebase: Google
Recurring events for the 31st of each month will not match on server/device
Posted by Account Management Team on 28 October 2009 04:12 PM
A monthly recurring event created on the server for the 31st of each
month will synchronize to the device on the last day of the month for
months with less than 31 days.  However, there will be no events in the
Google web client for these shorter months.  February, April, June,
September, and November will show no occurrence of the event.  The
device and server will not match.