DreamHouse Realty requires that house showings be scheduled within the current year to prevent too...

A validation rule is a feature that allowsadministrators to define criteria for data entry or import operations and display an error message when those criteria are not met. For example, a validation rule can ensure that house showings are scheduled within the current year by comparing the showingdate field with a formula that returns the current year. If the showing date field contains a date outside of the current year, then the validation rule will prevent users from saving or importing records with an error message. References:https://help.salesforce.com/s/articleView?id=sf.fields_about_validation_ rules.htm&type=5