ZyXEL → Warranty question

I'm thinking about getting the USG50 from Newegg since it's on sale and if so sticking it storage until the city's fiber service gets rolled out.

The thing that would make me skip this offer is if the warranty starts the day you purchase it rather than the day you register it.

Which is it? Does the warranty start the day you purchase it or the day you register it?

I do not know how it works in your county, but here the warranty starts when purchase it.