// using inbuilt formats
{{issue.resolutiondate.asLongDateTime}}
{{issue.MyDateFieldName.longDateTime}}
{{issue.created.jqlDateTime}}
{{issue.created.mediumTime}}
{{issue.Sprint.endDate.jiraDate}} - format the Sprint field's end date into a format suitable to set another field

// Or, you can specify the format
{{issue.dueDate.format("dd/MM/yyyy")}}
{{issue.created.as("dd MMM")}}