Sorry about that coRpSE totally missed that only because it is fine on my local without that index.php edit just the block, it now works fine on the web server, but I have got to ask why should that be, good on local but not on web?   yours and lonestars code is always good.

local php 7.4.24
local sql 7.4.24

web php 7.4.28
web sql 7.4.28

not a lot between them  

It's because your server does not have that PHP calendar function enabled. When the PHP was compiled on the server, they didn't enable it in the options.
That is why it works on most servers, but not all. I personally went with that function to give the ability to switch the type of calendar between a few different calendars. I may have to rewrite that a little to see if the function exist and if it doesn't, use the fix I give you.

Thanks again coRpSE