Android Question InApp subscriptions & Purchase date

I am experimenting InApp billings for subscriptions and for this purpose i enabled a second account for buying subscriptions.
The test subscriptions has a daily renewal so i suppose that the Purchase Date changes at every renewal (everyday). But in test enviroment it remains fixed and it is not changing from day to day.

My simple question is: does this behaviour is happening just in test enviroment or also in real situation?

Thanks in advance