This caught me a bit off guard on the gregorian day just passed, so I let it go until out of range. I have a calendrics background. I would say “since before the 2000s” but that is itself a calendric reference.
This seems to have originated in Russia but we see unesco in the meme.
This refers to a TOTALLY ARBITRARY attachment to the gregorian calendar according to Wikipedia. Not even as straight-forward as “Pi day” ( 3/14 ) or “Star Wars day” ( 5/4 )
I briefly lived with the indigenous Maya to study their work, and perhaps fork its root concepts in the current era ( badly in need of them ) or otherwise participate long-term ( and they basically set the bar for “long-term” ) … this is relevant here beyond calendrics since they mastered recursive internetworking architectures. Before I could embed in villages I had to do staging in a town frozen in the 1500s by UNESCO, by international treaty.
That is how global interests currently operate. They quell by support. Same as with “Christmas” being placed on the point when pagan calendrics had a major operation going on, at a time when there was a lot more mythological conflict distracting peasantry… I see unesco squashing a geopolitically tricky digital culture… but in the process, enfranchising “programmers” in a global elite ( which is not elite, and only paid in emotional forms while it is expedient ) … hacks within hacks at a level disrupting plans, shaping hearts and minds.
So, no 
but 
and 
This was the first celebration and now I see that … this was actually a work of our community in Dubai, UAE.
We cam start counting full moons until the next celebration.
Looks like the UNESCO program does differ from the Russian version.
I sit corrected on that aspect ( my apologies for missing the date difference )