Applying for Skilled worker dependent visa - start date of current visa

Sorry for asking this question again as I didn't get clear answer while going through previous posts on this topic.

I am applying to switch to Skilled worker Dependent from T2 ICT Long Term. One of the questions in the visa application is to specify the start date of the current visa or leave to remain. My T2 ICT visa has been extended once and I have received a new BRP with the a recent date of issue. Do I need to put the date of issue of my first BRP (which I collected when I first entered UK) or the issue date of my recent (renewed) BRP? Thank you in advance!

Can someone please help with this query