The Is year equals operator is used to select dates with a year value that exactly matches the YYYY component of the date that is entered in the condition input field. All other date components are ignored.
Setting the Date condition of a Birth date field to Is year equals, and entering 12/12/1978 as the input field value, selects all those contacts whose birth year matches that value. In this instance, all contacts born in 1978 are selected.
The Is year equals operator applies to date data types.
See Input field types for more about each input field.