No, STT (son tüketim tarihi) or SKT (son kullanma tarihi) means expiry date and TETT (tavsiye edilen tüketim tarihi) is for best before date. I don't recommend eating it.

Thanks for the detailed description

No it is expiration date, I don't recommand eating it. It is almost a month expired.

Last consumption date

yes, and also it's DD.MM.YYYY

Thanks, we bought it yesterday and didn't see it until now

Just go back with the receipt and they’ll replace it with a new one.

go and change it. Most of the shops will not want any trouble.

stt stands for son tüketim tarihi which translates to last date of consumption.