-0430
refers to 4 hours 30 minutes behind UTC. If the offset is zero,
+0000 is used. The modified commands <code class="docutils literal notranslate"><span class="pre">%Ez</span></code> and <code class="docutils literal notranslate"><span class="pre">%Oz</span></code> insert a
<code class="docutils literal notranslate"><span class="pre">:</span></code> between the hours and minutes: -04:30. If the offset
information is not available, an exception of type
<code class="docutils literal notranslate"><span clas