The Marvel Cinematic Universe fandom page gives the dates of the Snap and the Blip as "Spring 2018" and "October 2023".
You would think that these dates would be well known to all in-universe similar to, but way beyond, D-Day, Pearl Habor, Armistice Day, 9/11, etc. (pick your date depending on your culture)...
Are there any more specific dates known for these events? At what level of canon?
Bonus Question: If there is no specific date known, was this a specific behind-the-scenes decision to avoid issues in the real world each year?