uot;unit must be one of &#39;ms&#39;, &#39;s&#39;, &#39;m&#39;, &#39;h&#39;, &#39;d&#39;, &#39;M&#39;, &#39;y&#39;&quot;</span>
    <span class="n">mapping</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;ms&quot;</span><span class="p">:</span> <span class="s2">&quot;millisecond&quot;</span><span class="p">,</span> <span class="s2">&quot;s&quot;</span><span class="p">:</span> <span class="s2">&quot;second&quot;</span><span class="p">,</span> <span class="s2">&quot;m&quot;</span