Ticket_tracking__c is a date type field and Old_register_tracking__c is a formula field.
I need the formula field like, while i am trying to change the Ticket_tracking__c field, then the prior values of Ticket_tracking__c has to saved in formula field by adding comma(,) between the values.
But here i have one condition i.e, while i am trying to change the Ticket_tracking__c field only the formula field needs to reflect. Formula field should not reflect when the other fields is getting modified.
could you please give any suggestion for this realtime task.. For Example I Need :: 1/1/2017;1/2/2017;1/3/2017 like this get from formula field.