re.com">Open<abbr
title="Virtual Memory System">VMS</abbr></a>,
<a href="https://www.oracle.com/database/">Oracle Database</a>,
<a href="https://www.oracle.com/solaris">Oracle Solaris</a>,
and <a href="https://blackberry.qnx.com/en">QNX</a>.</p>
<p>
Each main entry in the database represents a <dfn>timezone</dfn>
for a set of civil-time clocks that have all agreed since 1970.
Timezones are typically identified by continent or ocean and then by the
name of the largest city within the region containing the cl