39;     - shift time by &#39;h&#39; hours, &#39;m&#39; minutes and &#39;s&#39; seconds
    &#39;h:m&#39;       - shift hours and minutes only
    &#39;h&#39;         - shift specified number of hours</code></pre>

<p>Timezone shifts are specified in the following formats:</p>

<pre><code>    &#39;+h:m&#39;      - shift timezone by &#39;h&#39; hours and &#39;m&#39; minutes
    &#39;-h:m&#39;      - negative shift of timezone hours and minutes
    &#39;+h&#39;        - shift timezone hours only
    &#39;-h&#3