Date Formula Error: Invalid Value

I'm trying to +/- months from a date, but I receive "invalid value" whenever there's a change in "year".


Example:

=DATE(YEAR(date12), MONTH(date12) + 6, DAY(date12))

If Date is 12/31/2020, then it creates an error because the new date needs to be in 2021 (6 months from 12/31/2020)

How can I fix this?

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