Using the CLI would also be fine, but we recognize that the JavaScript web UI is more up to date and feature rich compared to the Golang CLI.

Thank you for your consideration. My hope would be to use the times in the web UI when creating a calendar (and it’s iCal feed) for Shabbos and holidays. A “Chabad” option, if you will. (Chabad.org doesn’t have nearly as much flexibility in creating iCal feeds as Hebcal.com.) It would matter in terms of havdala and fast days, for instance.

https://www.chabad.org/library/article_cdo/aid/357752/jewish/Special-Dates-on-the-Chabad-Chassidic-Calendar.htm