<p>The "Z" (zulu) character in the timestamp string implies that all timestamps should be returned in UTC-0, no matter what time zone the server runs in.</p>
<p>I also remember seeing some issues when populating the database via osmosis from a UTC+3 terminal (see this year's GSoC project: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="333050332" data-permission-text="Issue title is private" data-url="https://github.com/osmlab/yalcha/issues/11" data-hovercard-type="issue" data-hovercard-url="/osmlab/yalcha/issues/11/hovercard" href="https://github.com/osmlab/yalcha/issues/11">osmlab/yalcha#11</a>). This ended up creating wrong timestamps all over the place. Not sure, if this behaviour would be any different with osmosis and <code>timestamp with timezone</code>.</p>

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