Thanks for the bug report! We are terribly sorry for this inconvenience.

The issue has been fixed and the URLs work correctly once again.

You should celebrate your birthday every year!

Hebcal uses the anniversary algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz, which accords with Ashkenazic practice. Reingold and Dershowitz write:

Someone born on the thirtieth day of Marcheshvan, Kislev, or Adar I has his birthday postponed until the first of the following month in years where that day does not occur. [Calendrical Calculations p. 111]

In other words, on years where there is no 30th of Kislev, your birthday is celebrated on the 1st of Tevet.

Feature was released on December 1 and is currently available. Please give it a try and let us know how it works for you!

Thanks for the suggestion. Effective December 2025, we now support Hebrew dates in the Yahrzeit API as an alternative to Gregorian dates:

• hyX=5749 – Hebrew year
• hmX=Kislev – Hebrew month
• hdX=25 – Hebrew day of month

Hebrew month names may be specified in Hebrew (UTF-8) or transliterated using the same technique as on the Hebrew Date Converter REST API.

Please give it a try and let us know how it works for you!

Glad you were able to get this worked out!

Yes, we discovered a DNS error and fixed it last night. Our sincere apologies!

can you send a screenshot? We don’t see any errors 

when using the API, to get the next occurrence, omit the start and end parameters, and specify years=2. Then, in the returned results, examine the date in the first item. If the date is before today, then ignore the first item and use the second item. If the date of the first item is today or later, then the first item is the next upcoming observance.

Thanks for your question. We do not plan to offer moon cycles and eclipses. Hebcal's mission is to increase awareness of Jewish holidays and to help Jews to be observant of the mitzvot.

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.

Thanks for your question. We do not plan to offer USA or other country-specific holidays, nor do we plan to offer any secular holidays. Hebcal's mission is to increase awareness of Jewish holidays and to help Jews to be observant of the mitzvot.

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.

Google and other calendar software providers already offer United States holidays. You can subscribe to the United States holidays iCalendar feed here:

https://www.google.com/calendar/ical/en.usa%23holiday@group.v.calendar.google.com/public/basic.ics

And Apple similarly provides their own holiday calendar feed:

https://calendars.icloud.com/holidays/us_en-us.ics