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Gadivemula Krishna 6Gadivemula Krishna 6 

formula looking at last time a field value changed..?

I have a piclist called Account type . Whenever the value changes, I need to store the day in another field. 

SwethaSwetha (Salesforce Developers) 
HI Krishna,
You can use a Process Builder/Workflow Rule/Trigger to achieve this. Just create a custom Date/Time field, choose the appropriate method you want to use (e.g. Process Builder), define the action to fire when it meets your criteria (e.g. ISCHANGED(StageName) && NOT(IsClosed)), and use an action to set the Date/Time field.

Reference : https://salesforce.stackexchange.com/questions/294544/automatic-date-stamp-on-a-stage-change
https://salesforce.stackexchange.com/questions/159771/workflow-rule-to-timestamp-created-updated-datetime-in-specific-format

If this information helps, please mark the answer as best. Thank you