I have a formula that does not work now because of the new year.

This formula has been working just fine until the month of December and now returns #invalid Data Type" I assume it is because it is looking for dates within this calendar year and not next calendar year? Does anyone have any suggestions on how I can fix this problem?

The formula looks at the Determination Date and then adds 1 month to that date and enters it into the cell this formula is in. Or the "Conditional License" Which is 1 month after the determination date and lasts for 6 months.

=IF([CONDITIONAL LICENCE]@row, DATE(YEAR([Determination Date]@row), MONTH([Determination Date]@row) + 1, DAY([Determination Date]@row)), "")

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