My employer put the starting date as 9/28 instead of 10/1. Is it ok?

HI,

I am working on L1B right now from Company A, company B has filed for my H1B and put the starting date as 9/28. HR said that they can either put 9/28 or 10/11 because that is their payrol cycle.

Can I start working effective from 9/28 instread of 10/1?

No, you can only start from Oct 1st 2013 and your visa will also have Oct 1st as the start date.