How to save the date certain transition happened Edited

[Wagner Barbosa]

Is it possible to save the date that certain transition happened? For instance, regardless how many assignees certain task had, I want to know in which date assignee changed to "Peter". Thank you,

[Heather Ronnebeck]

You're going to have to use the jql and have it include something along the lines of:

assignee was Peter and assignee changed during (date1,date2) 

 The date range isn't a great solution, but it's the first step on how I'd tackle it. 

[Wagner Barbosa]

Thank you for your help!