22.3 years is a lot of years, but not all of those years are created equal.

Every 4 years in the modern calendar is a leap year where we have 1 extra day. So therefor the equation for finding the amount of days before something is funny is (22.3 * 365) + 5, as there are 5 leap years within 22.3 years.

After doing the math this means that it would take 8,144.5 days before something tragic is considered funny. And because the first plane hit the twin towers on September 11th, 2001 at 8:46am that means that 9/11 is officially funny on December 29th, 2023 at 8:46PM Eastern Standard Time.

Mark your calendars.