Hi, thanks for the suggestion!

We don't yet offer a REST API for this, but this is a very good idea. We'd like to implement this feature but it will take some time to do so.

In the meantime, if your system is built in JavaScript, you can use the @hebcal/core NPM package to do the Yahrzeit conversions

https://www.npmjs.com/package/@hebcal/core

Hi, thanks for using Hebcal!

Molad details are included on our .ics calendar export (for Google, Apple, and Microsoft Outlook 2007 and later) if you create a custom calendar at https://www.hebcal.com/hebcal and you check both "Special Shabbatot" and "Rosh Chodesh".

You'll see the molad details in the notes/description section in each "Shabbat Mevarchim Chodesh" event

Hi, thanks for using Hebcal.

Can you check your candle lighting times and confirm you are using 18 minutes before sundown? This is the Hebcal default but you may have set it to another value, for example 38 minutes before sundown.

Hebcal is correct.

When the actual date of Yom Hashoah falls on a Friday, the state of Israel observes Yom Hashoah on the preceding Thursday. When it falls on a Sunday, Yom Hashoah is observed on the following Monday. In the United States, Days of Remembrance runs from the Sunday before Yom Hashoah through the following Sunday.

2021 Thursday, April 8

https://www.ushmm.org/remember/days-of-remembrance/resources/calendar

Thanks for the bug report! The problem has been fixed now. We're very sorry for the inconvenience.

Thanks for this bug report. We aren't able to reproduce the error; it may have been a transient network failure. Can you try again and see if the problem persists?

Shabbat shalom!

Hi, thanks for using Hebcal - and sorry to hear about this inconvenience.

Our perpetual feeds are deliberately kept small to let calendar apps run more quickly.

If you'd like to see past year(s) events for historical reference, you can use the "Alternate option" on the download dialog box to get a past year .ics file on your Mac desktop. Then, you can import that into the calendar application of your choice (e.g. the macOS Calendar.app).

This approach lets you have a private copy (not feed) of past calendar events which won't refresh automatically.

Marc, I'm really sorry, we aren't able to get on the phone to offer support.

I hope our unsubscribe instructions are clear enough that you'll be able to follow them and remove the 100's of duplicates.

Not currently. ShulCloud (a commercial software system) allows this level of flexibility. CiviShul (open source) might also allow this customization.