KosherJava Zmanim API

Business Profile

Core Value Proposition

KosherJava Zmanim API provides accurate zmanim calculations and supports in-flight integration with airline entertainment systems.

Target Customer

Software developers (especially Java) needing accurate Jewish time calculations; airlines and in-flight entertainment (IFE) providers; travel tech vendors integrating zmanim into apps and maps.

Key Differentiator

Open-source Zmanim library with multi-language ports (Java, JavaScript, .NET); supports real-time, location-based zmanim on moving platforms (airplanes); includes astronomical noon/midnight calculations and Parsha/Shabbat features; emphasizes up-to-date timezone data tooling and validation; active release history and community-driven development.

Implementation Timeline

Key releases and implementations include: Zmanim API 2.4.0 released November 27, 2022; Zmanim API 2.5.0 released June 9, 2023 (Java-based, Maven/GitHub); El Al in-flight Zmanim app deployed and live by February 2023; detailed El Al/Zmanim integration narrative published in 2023.

Pain Points

1Calculating zmanim accurately on moving platforms (aircraft) where location, speed, and time zones constantly change.
2Maintaining up-to-date timezone data (tz database) to prevent large errors in zmanim calculations across regions.
3Debugging and validating zmanim outputs in complex environments (e.g., in-flight apps) and integrating with third-party systems like FlightPath3D.

Key Features

1Zmanim API with support for chatzos, alos/hashachar, sunrise, etc., including dynamic calculations for moving locations.
2Astronomical noon and astronomical midnight calculations (enhanced precision in Arctic/Antarctic locations).
3Special calendar features: upcoming Parshah, Shabbasos/Parshiyos, Yom Kippur/Katan, and Tefila rules via TefilaRules.
4Upcoming Parshah retrieval and extended Jewish calendar capabilities.
5Open-source ports and releases (Java-based library; JavaScript port KosherZmanim; .NET framework) with Maven/GitHub distribution.
6In-flight integration use-case: real-time zmanim on flight maps powered by FlightPath3D and El Al in-flight systems.

Target Customer Industries

Decision Makers

1CEO, FlightPath3D
2Head of Inflight Entertainment & Connectivity (El Al)

Client Results

1Real-time zmanim displayed on El Al’s in-flight maps, calculated based on aircraft location and flight path with frequent recalculation (multiple times a minute).
2Countdown times to upcoming zmanim displayed within in-flight app context.
3Support for multiple international cities and bilingual English/Hebrew in the Zmanim experience.
4Integration with FlightPath3D and El Al’s in-flight entertainment ecosystem to deliver accurate zmanim without local device-only calculations.

Competitive Advantages

1Open-source licensing and community-driven development (LGPL tag indicates licensing context).
2Cross-language availability (Java library with JavaScript and .NET ports).
3Real-time, location-aware zmanim calculations for moving platforms (aircraft).
4In-depth calendar features (Parshiyot, Shabbos, tefila rules) beyond basic zmanim.
5Active maintenance and clear release history with feature enhancements (e.g., astronomical calculations, upcoming Parshah).
6Emphasis on up-to-date timezone data and guidance for tz database updates.

Key Benefits

1Accurate, real-time zmanim even on moving platforms (airplanes).

2Broad calendar functionality (Parshiyot, Shabbos, etc.) and Tefila rules.

3Open-source accessibility with multiple language ports and active releases.

4Up-to-date timezone data guidance to minimize calculation errors.

Case Studies & Success Stories

El Al In-Flight Zmanim App powered by KosherJava

Case #1

KosherJava’s Zmanim calculations power El Al’s in-flight zmanim within FlightPath3D’s flight maps. The app shows zmanim based on the aircraft’s current location, speed, and path, with countdowns to upcoming zmanim and a compass bearing to Jerusalem. It supports multiple cities, English/Hebrew UI, and includes a security-reviewed workflow for reporting issues. The integration involved collaboration with FlightPath3D and El Al’s IFE team, culminating in a live in-flight app (as of early 2023) and ongoing improvements.

Additional Product Information

Product Description

Open-source Java-based library for calculating Jewish time events (zmanim) with features for precise times, calendar calculations, and in-flight applicability. Includes ports and releases for JavaScript and .NET, and integrates with airline IFE systems via examples like El Al’s Zmanim app.

Target Market

Software developers building Jewish calendar/time calculations; organizations delivering in-flight entertainment or travel tech experiences; airlines and IFE vendors seeking accurate zmanim integrations.

Unique Value Proposition

Open-source, cross-language Zmanim solution with real-time flight-based calculations, comprehensive calendar features, and active maintenance, enabling airlines and developers to deliver accurate zmanim in dynamic environments.

Technical Requirements

Java-based library; distributed via Maven and GitHub; licensing indicated by LGPL tag; supports JavaScript port (KosherZmanim) and .NET port; relies on up-to-date tz database tooling for accuracy.

Pricing Model

Open Source; freely available for use and modification.

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