Date Time formats

[Tom Velarde]

We use a Date/Time field to schedule tasks, but the field displays on the view screen as "Tomorrow" or "Today" or in "6 Days Ago". How can I configure it to display the actual date and time? It only displays it when you hover or if it's more than 1 week in the future or in the past. 

[Sreenivasaraju P]

As your using cloud version , i don't think you can change format. 

Please refer below link for details

https://community.atlassian.com/t5/Jira-questions/Date-Time-format-display-on-Jira-issues/qaq-p/667703