I have a custom field completed date .this field captures all the field value when any task status changed to completed.
Totally i have 4 tasks , in which i want difference between two tasks in a formula field ... task1__c and task2__c .when both task status changed to "completed" , custom field "completed date" captures the status value .
I want difference between these two tasks when status is changed to completed.I have two different record types for these two tasks.