Sounds fun, now update every computer system simultaneously to a new date format.

"Sol" is a terrible month name, but the general idea is cool.

Would be nice to realign September, October, November, and December as the 7th, 8th, 9th and 10th months respectively

How do you write the date for the "leftover" day? Like, thinking about dates in Excel.

12 Month are better for dividing a year, which is often needed. I know it will never change, but I propose 12 30-day month and 5,25 extra days at the end of a year. Also 5-day weeks or 10 day weeks and every year starts with the same day.