Help re PHP date function and help website

Hello. I'm looking at the php date function. easy enough.

https://www.php.net/manual/en/function.date.php

However

Question:- where is the help page to tell us what all the various
letters mean ?

January (month in full)
Jan  (small month )   etc...

i remember this from somewhere but i cant find it on the above page.

QUESTION: How do we ask / recommend that the page be amended ? -0 to
add all the letters & meanings, or add a link to the page that tells
us that ?

Question- what are the letters  for a full month, and big month ?


ADMIN:-  can the 'help' email command be added at the bottom of each message ?

[email protected]  - took me 20 mins to find / try it,

-- 

Gordon.