Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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You need to make some Advanced JIRA configuration in the jira-config.properties or jira-application.properties file as following content:
| Preferred Date | Configuration for Date Picker |
|---|---|
| 01/Dec/12 17:04 | jira.date.picker.javascript.format=%e/%b/%y jira.date.time.picker.javascript.format=%e/%b/%y %H:%M jira.date.time.picker.java.format=dd/MMM/yy H:mm jira.date.picker.java.format=dd/MMM/yy |
| 1.10.12 17:04 | jira.date.picker.javascript.format=%d.%m.%y |
You can refer to the date picker format for different types of date and time formating.
Note