ShiftTime($dateTime, $shift);</code></pre>

<dl>

<dt id="Inputs">Inputs:</dt>
<dd>

<p>0) Date/time string in EXIF format (eg. <code>2016:01:30 11:45:00</code>).</p>

<p>1) Shift string (see below) with optional leading sign for shift direction.</p>

<p>2) [optional] Direction of shift (-1 or +1), or 0 or undef to use the sign from the shift string.</p>

<p>3) [optional] Reference to time-shift hash -- filled in by first call to <b>ShiftTime</b>, and used in subsequent calls to shift date/time values by th