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<h1><code>ISDATE</code> Function</h1>
  <p>Determines whether the specified value is a text string that can be parsed into a date/time with or without a time
  zone offset.</p>
  <h2>Syntax</h2><code>ISDATE(<i>value</i>)</code><br>
  <h2>Parameters</h2>
  <ul class="args">
    <li><i>value</i>: scalar<br>
    The value to inspect.</li>
  </ul>
  <h2>Return Value</h2>Returns 1 if <i>value</i> is a valid date/time string, and returns 0 if not.<br>
  <h2>Example</h2>
  <pre>PRINT ISDATE('2016-03-07');  <i>-- "1"</i><br>PRINT ISDATE(1234);  <i>-- "0"</i><br>PRINT ISDATE('foo');  <i>-- "0"</i><br>PRINT ISDATE('2016-01-23 22:06:53.742 -04:00');  <i>-- "1"</i>
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