Question re Time of Day of Expiration

Before I start trading light crude futures options, I have a question. First, I understand what day these options expire based on the contract month. But what time of day is the last trade accepted? Reasons for confusion: Globex trading hours 6:00 PM-5:15 PM EST. Floor 8:20AM to 1:30 PM. Settlements prices are quoted at 11:30PM. So, what time of day do these options expire? Thanks.
 
Appreciate the response. The crude options, though, expire three business days before the futures--it is statement correct? I know that the FEB11 futures expire January 20th, 2011 (Thursday). Therefore, the FEB11 futures options must expire on January 14, 2011--since the 17th is a holiday. Even so, I assume that the time of day of expiration is at 2:30PM EST. Thanks again.
 
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