Yahoo blocks link now. If you go to google put in DMND. Get a quote. The information is on the right if the chart from google. Scroll down a bit and you will see the dates.
Add DMND to my calendars
Mar 15, 2013
Q2 2013 Diamond Foods, Inc. Earnings Release Add to calendar
Feb 18, 2013
Q1 2013 Diamond Foods, Inc. Earnings Release Add to calendar
Jan 14, 2013
Diamond Foods, Inc. 2012 and 2013 Annual Meeting of Stockholders
Wasn't Q1 2013 reported December 17, 2012?
FWIW, Bloomberg (subscription terminal) shows Q2 2013 to be released 3/18/13.