if (DateTime.TryParse(v.ToString(), CultureInfo.CurrentCulture, DateTimeStyles.NoCurrentDateDefault, out DateTime result))
{
    return DataType.DateTime;
}
//3/3/2015 12:00:00 AM
if (DateTime.TryParseExact(v.ToString(), "MM/dd/yyyy hh:mm:ss tt", CultureInfo.CurrentCulture, DateTimeStyles.NoCurrentDateDefault, out DateTime dateTimeV3))
{
    return DataType.DateTime;
}