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The answer is that this would be possible, except that Confluence developers failed to implement a default user timezone setting ( . Rejoice! As of Confluence 9.3.1, a default timezone may be set.
)Jira server Atlassian JIRA serverId 144880e9-a353-312f-9412-ed028e8166fa key CONFSERVER-16057
To review, the timezone users see in Jira and Confluence comes from one of various levels:
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