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%{issue.resolutionDate}

Read

Returned value	Date and time of the most recent update of the issue's resolution
Output data type
Example output	19/Mar/20 1:38 PM

When cast to text, the output depends on the jira.date.time.picker.java.format parameter set in your Jira instance.

19/Mar/20 1:38 PM would be returned for dd/MMM/yy h:mm a