It’s regional. I grew up in Australia, where it’s pronounced as it is in the US: dah-tah. But I now live in the UK, where it’s pronounced day-tah.
The same is true of “router”, the network device (but not the woodworking tool): rau-tah vs roo-ter.
Working in IT made it a ballache for a while until I remembered to always change my pronunciation for them. 🙄
That’s a fair point. I shouldn’t have generalised your entire country, as it has so many linguistic differences.
Even outside of the whole pop/soda/Coke thing. 😄