Test Management for Jira (TM4J) uses the same time and date format configured in Jira. Jira system administrators can configure the format in the Look and Feel page. It allows you to customize the way times and dates are presented to users throughout the TM4J and Jira user interface.
1. Head to Administration>System page:
2) Go to the User interface section and then click on Look and feel:
3) In the Date/Time formats configure the desired formats. Bear in mind these changes will affect both Jira and TM4J.