Go to Control Panel -> Calendar -> Add Event
Set the Repeat to Daily.
Select the End by, and set the year combo to 2012!
When you Click on Save button, you get an error message: "Your request failed to complete."
It is OK, because you set a past time into the Repeat, but the message doesn't contain this information.
Please complete the error message with the reason of the failure.
It is working good on ee-6.1.x Git ID: af3a7261600cc0cd682694b21fae67751dffb51d.