Weekly calculations change every Sunday at midnight in the city’s local time zone.

The returned JSON results includes a list of items that have a category will typically include each of the following:

• candles – Candle-lighting on Friday or erev chag
• parashat – Parashat HaShavua, the weekly Torah portion
• havdalah – Havdalah, the end of Shabbat

Depending on the week of the year, other items may appear in the results, including

• holiday (with subcat major or minor or fast)
• zmanim (often with subcat fast for “Fast begins” or “Fast ends”)

This API uses a similar URL and response format as our full Jewish calendar REST API, but offers less control over the dates and times. If you find you want more fine-grained control over the date ranges, or what kinds of events are included and which are excluded, we recommend using the full Jewish calendar REST API instead.

Thirteen times between 1800-2200. 

1816

1824

1854

1911

1922

1930

1968

2006

2025

2055

2120

2158

2177

Thanks for getting back to me. We need to first do the lower-level Zmanim integration. We have to do a small amount of porting from KosherZmanim/KosherJava because that 4-year-old package depends on the bloated Luxon library; our fork uses the new JS Temporal. 

Once that's done, it should be more straightforward to add a "Chabad" checkbox to the Hebcal Custom Calendar creator, and a Chabad option for the iCalendar feed for Zmanim.

Again, no promises on when - this is probably a day or two of work. We'll keep this ticket open and update as we make progress and have something for you to test.

Thanks for this suggestion. We will endeavor to add these to the Hebcal TypeScript libraries. We can't promise a date by when we will complete these - Hebcal is a volunteer gig, not our day job.

Would you expect to use these as a software developer via web APIs like our Zmanim (halachic times) API, or as an end user with some sort of web pages and calendar feeds? 

Note that we don't currently have any Zmanim web pages on hebcal.com, and our iCalendar feed for Zmanim is considered experimental and doesn't really have a proper web UI. The hebcal.com website is currently more focused on holidays, date conversion, Yahrzeits, and Torah readings. It only exposes a very limited subset of zmanim (candle-lighting, havdalah, and fast start/end times) to end users via the custom calendar creator feature.

We have added this feed to to https://www.hebcal.com/ical/ 

Thank you for this reference 

Encyclopædia Britannica has an excellent introduction to the Jewish calendar. Another well written treatment of the Jewish calendar can be found in Understanding the Jewish Calendar by Rabbi Nathan Bushwick.

Calendars created by Hebcal are easily downloaded and imported into various calendar apps, including iPhone, Google Calendar, Outlook PC, Outlook Web, macOS Calendar, and any app that supports iCalendar (.ics) feeds or subscriptions.

The calendar apps from big companies (Google, Apple, Microsoft) all support the ability to view multiple calendar feeds together in a single view.

Because you probably already use one of these calendar apps, the easiest way for you to merge multiple Yahrzeit calendars together is to leave them as separate calendars on the Hebcal side and then visualize them as merged calendars in your destination calendar app.

We don’t have any plans to add a merge feature to the Hebcal Yahrzeit + Anniversary Calendar.

Hi, if you want just candle lighting, havdalah, and fast start/end times, you can use our iPhone instructions here

https://www.hebcal.com/home/77/iphone-ipad-jewish-holidays

If you are looking for other halachic times. we have an experimental zmanim calendar feed with some instructions here

https://www.hebcal.com/home/4522/zmanim-icalendar-feed

Configuration is quite a bit more tricky as this is not really a fully finished feature. you need to be comfortable editing URLs and will need to either use your ZIP code if you live in the USA or find your geoname id on the Hebcal website

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