//rdrr.io/pkg/MazamaCoreUtils/man/parseDatetime.html" class="external-link">MazamaCoreUtils::parseDatetime()</a></code>. For non-<code>POSIXct</code> values,
the recommended format is <code>"YYYY-mm-dd HH:MM:SS"</code>.</p>
<p>Timezone determination precedence assumes that if you are passing in
POSIXct times then you know what you are doing.</p>
<ol><li><p>get timezone from <code>startdate</code> if it is <code>POSIXct</code></p></li>
<li><p>use passed in <code>timezone</code></p></li>
<li><p>get timezone f