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Reflect the actual start date, and not the date it was announced. Also correct documentation on IllegalArgumentException that was showing the start date of the Bavli start date.
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README.md

KosherJava Zmanim API

The Zmanim library is an API for a specialized calendar that can calculate different astronomical times including sunrise and sunset and Jewish zmanim or religious times for prayers and other Jewish religious duties.

These classes extend GregorianCalendar and can therefore use the standard Calendar functionality to change dates etc. For non religious astronomical / solar calculations use the AstronomicalCalendar.

The ZmanimCalendar contains the most common zmanim or religious time calculations. For a much more extensive list of zmanim use the ComplexZmanimCalendar. This class contains the main functionality of the Zmanim library.

For a basic set of instructions on the use of the API, see How to Use the Zmanim API, zmanim code samples and the KosherJava FAQ. See the KosherJava Zmanim site for additional information.

Get Started

To add KosherJava as a dependency to your project, add the following dependency:

Maven

Add the following to your pom.xml file:

<dependency>
  <groupId>com.kosherjava</groupId>
  <artifactId>zmanim</artifactId>
  <version>2.1.0</version>
</dependency>

Gradle

Add the following to your build.gradle file:

implementation group: 'com.kosherjava', name: 'zmanim', version: '2.1.0'

License

The library is released under the LGPL 2.1 license.

Ports to Other Languages

The KosherJava Zmanim API has been ported to:

Web Api

There is a web api that returns json or xml and is based on the .NET port. It is available at https://wyrezmanim.herokuapp.com

Source code for the web api if you would like to self host is at https://github.com/greatjack1/dotnetcoreZmanim

Disclaimer:

While I did my best to get accurate results, please double check before relying on these zmanim for halacha lemaaseh.