Thanks for letting us know! There are multiple ways to transliterate the name of the holiday and both spellings are considered acceptable.

Thanks for posting that. From looking at the code snippet you sent, you are using the JSON Jewish calendar API.

The problem is in your code. This API returns dates and times using the standard ISO 8601 format. Dates will look like 2015-05-22T17:11:00-03:00

Check your application code and confirm that you are interpreting dates correctly with respect to the genonameid location you are using 

Hi, thanks for using Hebcal and the FullCalendar integration. We're sorry to hear that the page is very slow.

We have an experimental approach that uses the Hebcal JavaScript APIs (instead of the REST API) to avoid fetching event data over the Internet. You still need to load the FullCalendar and Hebcal javascript files, but once they're loaded the page won't need to fetch additional data.

Try this approach to see if it improves your page speed?

https://gist.github.com/mjradwin/7145590367c8b88a194f8da5e9a8d325

To add a bit more detail,

תִּשְׁרֵי (transliterated Tishrei or Tishri) is the 7th month of the Hebrew year, is 30 days long, and corresponds to September or October on the Gregorian calendar.

The holiday that occurs on the 1st day of Tishrei is called Rosh Hashana, the Jewish New Year. Rosh Hashanah is a major holiday.

The first day of Tishrei is not considered Rosh Chodesh. Rosh Chodesh is a minor holiday that occurs at the beginning of every month on the Hebrew calendar. In the case of Tishrei, the major holiday of Rosh Hashana takes precedence.

Later in the month we observe Tzom Gedaliah on the 3rd, Yom Kippur on the 10th, Sukkot (from the 15th-21st), and Shmini Atzeret (on the 22nd) and Simchat Torah (on the 23rd in the Diaspora).

For more info, read The Month of Tishri – Judaism 101.

Thanks for using Hebcal, and thanks for your question.

Rosh Hashana coincides with Shabbat and Sunday quite often, on average every 3-4 years.

9/14/1901 Sat, Rosh Hashana 5662

9/10/1904 Sat, Rosh Hashana 5665

9/30/1905 Sat, Rosh Hashana 5666

9/26/1908 Sat, Rosh Hashana 5669

9/23/1911 Sat, Rosh Hashana 5672

9/7/1918 Sat, Rosh Hashana 5679

9/23/1922 Sat, Rosh Hashana 5683

9/19/1925 Sat, Rosh Hashana 5686

9/15/1928 Sat, Rosh Hashana 5689

10/5/1929 Sat, Rosh Hashana 5690

9/12/1931 Sat, Rosh Hashana 5692

10/1/1932 Sat, Rosh Hashana 5693

9/28/1935 Sat, Rosh Hashana 5696

9/12/1942 Sat, Rosh Hashana 5703

9/8/1945 Sat, Rosh Hashana 5706

9/24/1949 Sat, Rosh Hashana 5710

9/20/1952 Sat, Rosh Hashana 5713

9/17/1955 Sat, Rosh Hashana 5716

10/3/1959 Sat, Rosh Hashana 5720

9/29/1962 Sat, Rosh Hashana 5723

9/13/1969 Sat, Rosh Hashana 5730

9/9/1972 Sat, Rosh Hashana 5733

9/6/1975 Sat, Rosh Hashana 5736

9/25/1976 Sat, Rosh Hashana 5737

9/22/1979 Sat, Rosh Hashana 5740

9/18/1982 Sat, Rosh Hashana 5743

10/4/1986 Sat, Rosh Hashana 5747

9/30/1989 Sat, Rosh Hashana 5750

9/14/1996 Sat, Rosh Hashana 5757

9/11/1999 Sat, Rosh Hashana 5760

9/30/2000 Sat, Rosh Hashana 5761

9/7/2002 Sat, Rosh Hashana 5763

9/27/2003 Sat, Rosh Hashana 5764

9/23/2006 Sat, Rosh Hashana 5767

9/19/2009 Sat, Rosh Hashana 5770

9/19/2020 Sat, Rosh Hashana 5781

9/16/2023 Sat, Rosh Hashana 5784

9/12/2026 Sat, Rosh Hashana 5787

10/2/2027 Sat, Rosh Hashana 5788

9/28/2030 Sat, Rosh Hashana 5791

9/24/2033 Sat, Rosh Hashana 5794

9/8/2040 Sat, Rosh Hashana 5801

9/21/2047 Sat, Rosh Hashana 5808

9/17/2050 Sat, Rosh Hashana 5811

9/13/2053 Sat, Rosh Hashana 5814

10/3/2054 Sat, Rosh Hashana 5815

9/29/2057 Sat, Rosh Hashana 5818

9/25/2060 Sat, Rosh Hashana 5821

9/10/2067 Sat, Rosh Hashana 5828

9/6/2070 Sat, Rosh Hashana 5831

9/22/2074 Sat, Rosh Hashana 5835

9/18/2077 Sat, Rosh Hashana 5838

9/14/2080 Sat, Rosh Hashana 5841

10/4/2081 Sat, Rosh Hashana 5842

9/30/2084 Sat, Rosh Hashana 5845

9/27/2087 Sat, Rosh Hashana 5848

9/11/2094 Sat, Rosh Hashana 5855

9/7/2097 Sat, Rosh Hashana 5858

9/27/2098 Sat, Rosh Hashana 5859

Hi, thanks for contacting Hebcal!

You can sync Hebcal iCalendar feeds with Airtable using instructions found in these two articles:

https://www.hebcal.com/home/210/icalendar-ics-jewish-holidays

https://support.airtable.com/docs/calendar-import-extension

Shana Tova!

Hello, thanks for using Hebcal.

We haven't implemented a way to delete a Yahrzeit calendar (this is on our TODO list) but you can remove all of the names from an existing calendar and it will remove the data from our servers.

Shabbat shalom!

Hi, thanks for using Hebcal!

You are correct that Hebcal does not list Havdalah times on Friday night October 4, 2024 (at the conclusion of the second day Rosh Hashana) or on Friday night October 25, 2024 (at the conclusion of Simchat Torah). This is intentional and is not an oversight. Because in year 5785 the holidays end on Friday night as Shabbat is coming in, we don't do Havdalah until Shabbat concludes on Saturday night.

Note Havdalah on Saturday night, highlighted in pink below:

Wishing you a good month of Elul and a happy and healthy 5784.