Does my ILR period on Skilled Worker visa start from date of decision or from date of starting the job?

I was on a global business mobility visa of 2 years but after a few months into my job I received an offer from my client company and they applied for a Skilled worker visa. Although I received a positive decision from my home office and I was granted permission to stay in the UK as a skilled worker from 12 Jan 2023 and 3rd March 2028, I did not start working for this new company until july 2024. A gap of nearly 7 months. The reason was, I couldn't have joined the client company directly without a cool off period of 6-7 months.

Question: 1. When did my 5 year clock to indefinate Leave (Permanent residency) start? T,he start date on my BRP or first working day of my first working day with the new company which is 6 months later than the brp issue date?