How can I edit the end date of a sprint after completing the sprint?
Not possible using the UI. You might change the database directly, while that is not recommended.
you can used the below api
put jiraserver/rest/greenhopper/1.0 /sprint/{spinrtID}
parameter : name=Iteration 2, id=337, startDate=12/Mar/14 8:13 AM, endDate=25/Mar/14 8:13 AM
`jiraserver/rest/greenhopper/1.0/sprint/{sprintId}/edit/model` will give you a starting JSON object
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