Automate the end date of an issue

[Deleted user]

I want Jira to change the end date of an issue from the projected date that the Sprint will end to the actual date I move the issue to the "Done" column on my board. Is this possible? 

[Jack Brickey]

Likely yes. What defines your end date? If that is a custom field or accessible field then you could use automation to copy the resolution date into that field when the issue was moved to done

[Deleted user]

Thanks. our sprints end on the last day of each month, at the moment, we have to manually change the date we complete a task from the last day of the month to the actual date it was completed.