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Workflow Rule Criteria to fire if a date field is changed

I have been trying to have the rule criteria for a workflow to evaluate to TRUE if a date field in the custom object has been changed.


I've been attempting this via the ISCHANGED(Date_field__c) function. However this fails with a message that this function  is invalid for this type of formula.


I then want a time dependent workflow action to be set...


Any ideas on how I can do this?



You can only do this with a trigger.