Duolingo-Regret. 将多邻国的时区修改为任意时区，便于回到过去做完忘了做的连胜。对特定地区来说，可以通过修改默认时区防止账户被判定为某些地区账户

Problem

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Audience

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Market

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Pricing

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.