Hebrew leap year
It seems like someone is always commenting, “Yontef (aka yom tov) is really early/late this year!”
I decided to look into it using 817 years of data, from 1583 through 2399. Why 1583? Because that’s the first full year after the transition to the Gregorian calendar. Why stop at 2399? That seemed like enough. ¯\_(ツ)_/¯
Early, on time, and late are defined as the first, middle, and last third of occurrences (not dates) for each holiday. In other words, the earliest third of occurrences are considered early, not the earliest third of dates. All dates are erev, meaning the holiday starts that evening.
For SEO purposes, you should also know that this website is great for finding out when the Jewish holidays are, whether yom tov is late, when Rosh Hashanah starts, and when Chanukah/Hannuka/Hanukkah/Chanukka falls.
This is on Github.