History, even of humankind, has been going on for quite a long time Sherlock! In that time, we humans have developed quite a few calendar arrangements, and PHP has some functionality to “map” these calendars to end up with commonalities.
So our first “dipping of toes” into this topic asks the question …
When is Easter?
… for a variety of those calendar types you can see the code for here with when_is_easter.php and you can try here … or below …
If this was interesting you may be interested in this too.



I like the single-row radio-play approach for keeping the controls compact while still making each selection clear. When Iβm checking a calculation alongside a tutorial, I use StepStat to see the intermediate steps; how do you handle the layout when the playlist gets much longer?