9;        - negative shift of timezone hours only</code></pre>

<p>A valid shift value consists of one or two arguments, separated by a space. If only one is provided, it is assumed to be a time shift when applied to a time-only or a date/time value, or a date shift when applied to a date-only value. For example:</p>

<pre><code>    &#39;1&#39;         - shift by 1 hour if applied to a time or date/time
                  value, or by one day if applied to a date value
    &#39;2:0&#39;       - shift 2 hours