hmmm is it today September 14 or 30 to be Yu-Gi-Oh! Manga 25th anniversary?

 

You may be wondering about the title. it's because on VIZ Media twitter says is today September 14th 2021 that the manga series makes 25 years, however according what I researched, suggests otherwise, because it's original run in weekly shonen jump was in September 30th 1996 Issue no.42-1996, then technically would be in September 30th 2021 that makes 25 years...
however, from further research, the release date of the magazine was 14th September which is today, while cover date is 30th September... but I don't understand the difference between any...it seems to according to this website:

https://www.kanzenshuu.com/manga/weekly-jump/

The differences are that the issue date is supposedly from what I understand, the issue date/cover date is 30th September but the "sale date"or release date is in 14th September?

It's very confusing for me, it seems to be related to the 2 holidays in September 1996 (3rd Monday of September was on 16th September 1996 while there was another in 23rd September,  and both were on Mondays) however, when in Japan when a holiday falls on Monday, Weekly Shonen Jump releases on Saturday, 14th September 1996 was on Saturday...

So what does it mean a cover date?

https://en.wikipedia.org/wiki/Cover_date

I get it better, it seems, that cover dates are meant to make "magazines still feel recent", it's actually a common practice worldwide, despite it was released a few weeks before...we can conclude that today is the 25th Anniversary of the manga series.

Today was a more trivia+research about the manga series, I got to learn new things, like holidays in japan, this "cover date" practice in magazines is not the actual release date of the magazine, interesting.

So...

Happy Birthday Yu-Gi-Oh! Mánga!

My manga collection on other hand is around 10 years old xDD