Prop 60 CA Timing of the sale

[Renata Eubank]

I turn 55 years old on Sept. 14 2020. I would like to use the prop 60 transfer of tax base. What constitutes the sale date of a property? Is it confirmation of acceptance, opening of escrow , close of escrow or something other than stated? I am asking to find out if I can list before my birthday find a buyer then move into escrow with the closing date set for after my birthday. Or to be safe should I wait till after my birthday to proceed with the start of process of the sale of my home as to not lose the opportunity given by prop 60?

Thank you for your help