VAF10 Dependent form Query

[trek]

Hi All,

Myself and my dependents were on tier 2 visa and were staying with me here in UK. They have gone back for a trip to India & Recently I have switched my UK Visa Status from Tier 2 to Tier 1 while my family were in India.Since my dependents are currently in india and I have switched my visa , they will be applying for Tier 1 dependent visa.

I am confused about the following quetion in the VAF 10 form, which my dependents in India are about to fill:

My Tier 2 was from valid from 10.03.2010 - 27.03.2011, I came to UK on 22.03.2010, and reported to work on 23.03.2010.

My Tier 1 Valid from 05.01.2011 - 05.01.2013

Query: 7.18 When did/will the main applicant’s job or course of study begin?
Now my dependents are applying for visa, but considering the above situation which date should be entered in the form ???

I had posted this question earlier, but did not get reply.
Request you all to kindly help me out.

Regards,
Trek