The symbol GLD has options available to it. Option naming doesn't appear to be consistent. For example, for a 2012/02/10 expiry for a GLD put at Interactive Brokers is 'GLD 120210P00167000'. 120210 is a Friday. On the other hand, through the API, I had requested options for 20120518, and I receive in response the options I need, but they are dated 120519, which is a Saturday: 'GLD 120519P00109000'.
Is any one able to shed some light on this? Responses can be sent to ray@oneunified.net and I'll update this post with a summary of what I receive.