Clone Date and Time Values
Clone Custom Field Values
All date and time custom field values can be cloned (e.g. Date Time Picker).
It is not possible to clone the creation and updated date, because Jira doesn’t allow us to modify these fields.
When Deep Clone clones an issue, a new issue is created in your Jira instance. That means that all date and time values (issue creation, comment creation, issue history) result from the time when the issue was created.
For issue comments, we add the original date as a prefix to the comment. If you don’t want to clone the original date as a prefix, you can prevent this in the clone dialog.