DAY
Returns the day component of the date supplied. Any leading zeros are removed.
DAY ( <date_field or date> )
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date_field or date: The date 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 the CUSTOMER table that shows just the day portion of a customer's date of birth.
DAY( [CUSTOMER.DATE OF BIRTH] )