L1 to H1

[esource]

Hi I came here on L1B in Sep 2001. In Dec 2002 I applied for H1B1 and I was on Pending H1B1 approval status as I left my L1B company in Dec 2002.

My H1B1 got approved in May 2003.

From what date does my 6 yrs start

Sep 2001 (When I entered on L1B)
or
May 2003 (When I got my H1B).

Thanks