%{issue.dueDate}
When cast to text, the output depends on the jira.date.time.picker.java.format parameter set in your Jira instance.
jira.date.time.picker.java.format
19/Mar/20 would be returned for dd/MMM/yy h:mm a
dd/MMM/yy h:mm a
Allowed input
2015-01-31 14:35 : date with time example
2015-01-31 14:35
2w, 3d, 4h, 5m : 2 weeks, 3 days, 4 hours and 5 minutes after current time.
2w, 3d, 4h, 5m
The allowed date-time format is defined at jira.date.time.picker.java.format
Additionally you can use the formats allowed in JQL queries: