With the publish timestamp feature you can switch between published pages and drafts, for example to compare the last officially published version with the current changes that has been made on that page. To use this feature, you first have to choose (or first to create) a Jira date/time picker field, in which you want to store the publish timestamp:
This field will be automatically filled with date/time of current publish timestamp. So every time a Confluence page is published, the customfield of linked Jira issue will be filled with that date. Based on the date of the field you can now switch between published and unpublished versions:
The button "View Published" will direct you to the latest Confluence page version with date BEFORE the current "Public Timestamp":
The button "View Draft" will direct you to the LATEST Confluence page version: