You still need to use the acutal entry date and provide the I-94 and the copy of the entry stamp (on your passport) if you want to extend your status or apply for green card, etc. in the future.
It was a mistake.
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                    谢谢老师。那我们要和USCIS说一下改正这个错误吗?
                     -autumnleaf99- 
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                        10/29/2015 postreply
                                                09:44:30
                    
                    
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                     -863211- 
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                        10/29/2015 postreply
                                                15:17:28
                    
                    
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                    多谢8老师!
                     -autumnleaf99- 
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                        10/29/2015 postreply
                                                19:26:55