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    <p>Your code suggests that the variable may be either a date or a string that looks like a date. Dates you can simply return wit a cast, but strings must be parsed. Parsing comes with two caveats;</p> <ol> <li><p>if you aren't certain this string can be parsed, then use <code>DateTime.TryParse()</code>. </p></li> <li><p>Always include a reference to the culture you want to parse as. <code>ToShortDateString()</code> returns different outputs in different places. You will almost certainly want to parse using the same culture. I suggest this function dealing with both situations;</p> <pre><code>private DateTime ParseDateTime(object data) { if (data is DateTime) { // already a date-time. return (DateTime)data; } else if (data is string) { // it's a local-format string. string dateString = (string)data; DateTime parseResult; if (DateTime.TryParse(dateString, CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal, out parseResult)) { return parseResult; } else { throw new ArgumentOutOfRangeException("data", "could not parse this datetime:" + data); } } else { // it's neither a DateTime or a string; that's a problem. throw new ArgumentOutOfRangeException("data", "could not understand data of this type"); } } </code></pre></li> </ol> <p>Then call like this;</p> <pre><code>ParseDateTime(g[0]["MyUntypedDateField").ToShortDateString(); </code></pre> <p>Note that bad data throws an exception, so you'll want to catch that.</p> <p>Also; the 'as' operator does not work with the DateTime data type, as this only works with reference types, and DateTime is a value type.</p>
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