Hi, thanks for writing to us. We're so sorry to hear about the difficulty you're having with Gregorian and Hebrew date conversion.

It's very important to us that we provide accurate information on our website. We checked and the date conversion is working correctly. Unfortunately, we aren't able to reproduce the error you mentioned. Could you send us a URL or a screenshot of the page where you are seeing something incorrect?

Please note that when converting from Gregorian to Hebrew dates there is an "After sunset" checkbox that can be checked or unchecked by the user:

Hi, thanks for using Hebcal!

Yes, the Hebrew Date Converter at https://www.hebcal.com/converter can convert from Hebrew dates to Gregorian dates.

If you are a software developer, the web API also supports conversion both ways

https://www.hebcal.com/home/219/hebrew-date-converter-rest-api

The Hebrew date converter can answer this question

https://www.hebcal.com/converter?hd=8&hm=Iyyar&hy=5782&h2g=1

• 8th of Iyyar, 5782 = Mon, 9 May 2022
• ח׳ בְּאִיָיר תשפ״ב
• 23rd day of the Omer
• Parashat Emor in the Diaspora
• Parashat Behar in Israel

Hi, thanks for using the Hebcal Apple Watch app... and congrats on your new watch.

We've seen this issue before, and it's a problem because our watch app doesn't have a companion iPhone app. This is a new feature that Apple introduced recently and there are still some bugs with how the user experience works. The long-term fix for us will be to release an iPhone companion app.

In the short term, however, the best workaround we can recommend is to go to the App Store on the watch itself and search for (and install) Hebcal. By installing the app directly on the watch, it seems to work around this error.

We hope this helps! Happy Gregorian New Year.

We recommend you first follow the aforementioned instructions to first remove all copies of Hebcal events from your calendars. The instructions you originally used to import Hebcal events were our previous Outlook Mac 2011 instructions. Outlook for Mac 2011 did not support iCalendar subscriptions and cloud sync, so it required downloading a copy of events from Hebcal.com and manually managing them on your desktop.

Starting with Outlook for Mac 2016, Microsoft now recommends that you sync your account to the Microsoft Cloud. “Available for Google, Yahoo, iCloud, and IMAP accounts in Outlook for Mac, this allows you to enjoy many of the best features of Mail and Calendar and Outlook for Mac.”

We recently published detailed instructions that show how to subscribe to Hebcal events in modern versions of Outlook for Mac using the cloud sync feature with Outlook Web (Outlook.com) account. Please follow these instructions to restore the Hebcal events to your desktop:

https://www.hebcal.com/home/3867/outlook-for-microsoft-365-for-mac-jewish-holidays-download

Hi, thanks for using the Hebcal Yahrzeit + Anniversary calendar.

Hebcal uses the yahrzeit algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz.

The customary anniversary date of a death is more complicated and depends also on the character of the year in which the first anniversary occurs. There are several cases:

• If the date of death is Marcheshvan 30, the anniversary in general depends on the first anniversary; if that first anniversary was not Marcheshvan 30, use the day before Kislev 1.
• If the date of death is Kislev 30, the anniversary in general again depends on the first anniversary — if that was not Kislev 30, use the day before Tevet 1.
• If the date of death is Adar II, the anniversary is the same day in the last month of the Hebrew year (Adar or Adar II).
• If the date of death is Adar I 30, the anniversary in a Hebrew year that is not a leap year (in which Adar only has 29 days) is the last day in Shevat.
• In all other cases, use the normal (that is, same month number) anniversary of the date of death.

[Calendrical Calculations p. 113]

Now, using the date you mentioned above:

Sat, 20 February 1988 = 2nd of Adar, 5748   ב׳ בַּאֲדָר תשמ״ח

Since 5748 was not a leap year, there was only one Adar that year. This means that the death occurred in 12th month of the Hebrew year.

Suppose one wishes to observe the yahrzeit in Hebrew year 5782. Since 5782 is a leap year and none of the other rules applies, we use the same month number as the date of death. In a leap year the 12th month is Adar I, so the yahrzeit is observed on 2nd of Adar I, 5782 (Thu, 3 Feb 2022).

More information here:

https://www.hebcal.com/home/54/anniversaries-adar-cheshvan-kislev

Thanks for the bug report!

We have fixed the error and the page is working correctly once again.

Our sincere apologies for the inconvenience.