This library provides some useful functions to deal with years.
```rust let year = 2020; let month = 2; let leapyear = yearhelper::isleapyear(year);
let daysinmonth = yearhelper::getdaysinmonth(leapyear, month); let daysinyear = yearhelper::getdaysinyear(leapyear); ```
https://crates.io/crates/year-helper
https://docs.rs/year-helper