How to calculate the length of stay in US using H1B visa?

0 votes
asked Feb 27, 2014 in H-1B by Triumph

Hi friends,

Currently I am working for employer A and they initiated H1B for me in April 2013 and got approved in Sept-30,2013. 

Petition approved date:

Sept-30,2013
 
Petition End date:
Sept-30,2014
 
I may have the project requirement only on June/July,2014.What is my doubt is that 'how can I calculate the length of stay in US if I get extension for 1 or 2 years'. 
 
That is what will be my H1B start date?
From the day my H1B petition is approved? or The day when my H1B visa is stamped? or The day When I enter the US on H1B?

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