What if the First arrival_date and Last Arrival_date are wrong in the I-129 petition??

[Ganapathi07]

I have lately realized that first arrival date and last arrival date was misprinted in I-129 form, which was applied in March 2011. I got my H1b approval in April 2011.

Please let me how it effects in future..and Do i need to correct it...

Please let me know the answer. greatly appreciated.