1. Go to Jira Settings>System>General Configuration>Advanced Settings
2. Set jira.date.picker.java.format=yyyy-MM-dd HH:mm
More date formats available in https://confluence.atlassian.com/adminjiracloud/configuring-the-look-and-feel-of-your-jira-applications-780861527.html?_ga=2.164134204.2090059034.1579749337-178697129.1579749337
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