I don't pretend to be skilled with Excel although I used it a lot in my pre-retirement years. I retired some 11 years ago. Now, I'm using the freebee LibreOffice Calc and it seems to behave very similar to Excel.
My point? Some Watchtower apologist may bring up the 360 day year instead of the 365+ day year those video creators used by using Excel's standard date addition. I decided to see if Excel (it's more popular when you do a Google search for help) had some 360 day year function I could understand. Sure enough, they both have the DAYS360 function. Recall that the video using Excel's standard date function returned a date -- not the Watchtower target of Sept 5-13, 1922 but Aug 7, 1922. That's about a month difference.
Using, however, the DAYS360 function calculation returns 8/25/1922. Yes, it cuts the Watchtower error in half but still no bragging rights for the Society and the apologist. That's still a two week discrepancy from Watchtower's Cedar Point start date.
Len Miller
ps: I don't have time tonight to paste my calc trail. If it's important perhaps someone else can take the time -- which will confirm or crash my numbers.