Japanese era converter for Rust.
Inspired by [mattn/go-erajp](https://github.com/mattn/go-erajp).
Convert a year to Japanese era.
```rust
assert_eq!(Some("令和"), erajp::to_era_from_year(2019));
```
Convert a day to Japanese era (using [chrono](https://crates.io/crates/chrono))
```rust
extern crate chrono;
use chrono::prelude::*;
let today = Local::today();
assert_eq!(Some("平成"), erajp::to_era(&today));
```
MIT
Tomochika Hara (a.k.a. thara)