After creating or editing a calendar event, the redirect to displaying the calendar uses a two-digit value for the querystring year (cal_y) variable - e.g. "12" when it should be "2012".
This is due to using the format 'y' instead of 'Y' with date().

This means that the wrong year is queried for events to display in the Monthly view block (in my case, showing no events at all).

Expected behaviour: Correct events are shown in the block.
Actual behaviour: No events are shown in the block.