YEAR
Returns the year portion of the date supplied.
YEAR ( <date_field or date> )
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date_field or date: The date field to use in the calculation.
Note: dates in Audiences need to be formatted as either YYYY-MM-DD or MM/DD/YYYY. Entering a date as 01-02-2023 would be read as Jan-2 not 1-Feb.
Example: create a field on CUSTOMER table to return the year part of each customer's date of birth.
YEAR([CUSTOMER.DATE OF BIRTH] )