This issue has still not been corrected. Megapixels18 is correct in all their posts about the incorrect date on line 9a of IL Form 2210. It should be 01/18/22 not 01/17/22 and there is NO WAY to override it.
From the instructions for IL 2210:
Line 9a - For each quarter, enter the date that corresponds with the
15th day of the 4th, 6th, and 9th month of your tax year and the 15th
day of the first month following the end of your tax year. If this date
falls on a weekend or holiday, use the next business day.
01/15/22 was a weekend day, 01/17/22 was a holiday, 01/18/22 was the due date for the 4th quarter installment.
