KosherJava
Zmanim calculation API and tools
Online
KosherJava is a developer-focused project providing a Java API and associated tools for calculating zmanim (Jewish prayer times and holiday times). It offers an open-source library, web-based zmanim maps, calendar generators, and related resources based on halachic calculations from the sefer Yisroel Vehazmanim.
Contact source checked 2026-11-07
Source ↗More details
The site is primarily a technical resource for programmers; the API has been ported to .NET and Objective-C. Email contact available via the contact page.
Address/area as listed on the organization's website, checked 2026-11-07
Confirm availability, fees, and any required supervision.
Common questions
How do I filter the internet for a frum home?
TAG (Technology Awareness Group) is a nonprofit with offices in many Jewish communities that helps people install internet filters and set up phones and computers to match their standards. Contact a local TAG office or your rabbi for guidance.
Source: TAG (Technology Awareness Group): TAG · checked 2026-11-07
How do I type in Hebrew on my phone?
On iPhone, go to Settings, General, Keyboard, Keyboards, Add New Keyboard and choose Hebrew; Apple's support page explains the steps, and Android phones have a similar language setting. Then switch keyboards with the globe key.
Source: Apple Support: Add or change keyboards on iPhone - Apple Support (KW) · checked 2026-11-07
How do I stop telemarketing calls?
Register your number free on the National Do Not Call Registry; you can also report unwanted calls there.
Source: Federal Trade Commission: National Do Not Call Registry · checked 2026-11-07
Short summaries written by JRA, linked to the source each one is based on. General information, not a halachic ruling.
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