DAY_OF_MONTH

Returns day of month of the provided date as an integer constant in the range 1-31

DAY_OF_MONTH (date)

Can be used in the condition of a FIND action.

Attribute of the Date type or date constant or calculation producing a date

Number: the day of the month of the date (1-31)

IF DAY_OF_MONTH (Account.OpeningDate) = 25 THEN ...