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HNT_NeoHNT_Neo 

Validation rule on user object when Is Active = False, a date field must not be null

Looking to creating a validation rule on the user object that when IsActive is unchecked, a custom date field (Deactivated_Date__c) must have a value if the save button clicked. If the custom date field is blank, user should receive an error to fill in the date if NULL. 

Is this possible? 
AND ( 
ISBLANK (Deactivated_Date__c),
(IsActive != NULL)
)

 
Raj VakatiRaj Vakati
yes ..try this
 
AND ( 
ISNULL (Deactivated_Date__c),
IsActive
)