Does 1-year international warranty start on purchase date or activation date?

I want to buy a Macbook Air M1, but there is a huge price difference between the US apple store and apple resellers in my country. However, there are people who buy Apple products in the US and then sell them in my country for around $100-$200 more than they bought it for. If I buy Macbook from them, will apple's 1-year international warranty start on the date I activate the laptop or on the date they purchased it?