heca-lib

heca-lib is a Hebrew <-> Gregorian converter library. It's the backend behind the heca program.

Usage:

1. Add to Cargo.toml:

   [dependencies] heca-lib = "*"

2. Add the following to your crate root:

   extern crate heca_lib;

3. Import the types:

   use heca_lib::*;

Overview:

This library converts from Hebrew to Gregorian dates and back. You can get a HebrewDate either from a known Hebrew date or from a Gregorian date:

extern crate heca_lib;

use chrono::Utc;
use chrono::offset::TimeZone;
use heca_lib::{HebrewDate,HebrewMonth};

assert_eq!(HebrewDate::from_gregorian(Utc.ymd(2018,9,10).and_hms(17,59,59)).unwrap(),HebrewDate::from_ymd(5779,HebrewMonth::Tishrei,1).unwrap());

You can then get back a Gregorian date from this Hebrew Date.

extern crate heca_lib;

use chrono::Utc;
use chrono::offset::TimeZone;
use heca_lib::{HebrewDate,HebrewMonth};

assert_eq!(HebrewDate::from_ymd(5779,HebrewMonth::Tishrei,10).unwrap().to_gregorian(),Utc.ymd(2018, 9,18).and_hms(18,00,00));

Notes:

1. This library won't work for years before 3764 (4).
2. This library is still unstable and the API may change at any time.
3. I tested this library against hebcal for all Rosh Hashanas between 3764 and 9999 (4-6239). I also checked it for all Rosh Chodesh Adars in those years. However, I take no resposibility if you accidently keep Yom Tov on the wrong day!
4. While this library works, there are still a few inefficienciess that need to be taken care of.

License:

MIT