internal static string AutoCompleteDate(string origtext)
{
string trimtext = origtext.Trim();
if (trimtext == "")
{
return("");
}
// retrieve Locale information
var dateorder = GlobalizationHelper.DateOrder();
// split the textbox.value up in 1,2 or 3 parts
string[] values = SplitInto3(trimtext);
// It is possible that the parts are all non-numeric
if (values[0].Length + values[1].Length + values[2].Length == 0)
{
return(origtext);
}
#region Support for unseparated dates xxyy, xxyyzz or xxyyzzzz
if (values[0].Length > 0 && values[1].Length == 0 && values[2].Length == 0)
{
string temp = values[0];
switch (temp.Length)
{
case 4:
values[0] = temp.Substring(0, 2);
values[1] = temp.Substring(2, 2);
values[2] = "";
break;
case 6:
values[0] = temp.Substring(0, 2);
values[1] = temp.Substring(2, 2);
values[2] = temp.Substring(4, 2);
break;
case 8:
if (dateorder == DateOrder.YMD)
{
values[0] = temp.Substring(0, 4);
values[1] = temp.Substring(4, 2);
values[2] = temp.Substring(6, 2);
}
else // DMY or MDY
{
values[0] = temp.Substring(0, 2);
values[1] = temp.Substring(2, 2);
values[2] = temp.Substring(4, 4);
}
break;
}
}
#endregion
// test a new datetime value
DateTime?candidate_value = null;
try // If the Date is invalid, there will be an Exception
{
#region Convert the 0, 1, 2 or 3-string-parts to a DateTime value, throws Exception upon failure
if (values[0].Length > 0 && values[1].Length == 0 && values[2].Length == 0)
{
candidate_value = new DateTime(DateTime.Now.Year,
DateTime.Now.Month,
Convert.ToInt32(values[0]));
}
else if (values[0].Length > 0 && values[1].Length > 0 && values[2].Length == 0 && dateorder == DateOrder.MDY)
{
candidate_value = new DateTime(DateTime.Now.Year,
Convert.ToInt32(values[0]),
Convert.ToInt32(values[1]));
}
else if (values[0].Length > 0 && values[1].Length > 0 &&
values[2].Length == 0 && (dateorder == DateOrder.DMY | dateorder == DateOrder.YMD))
{
candidate_value = new DateTime(DateTime.Now.Year,
Convert.ToInt32(values[1]),
Convert.ToInt32(values[0]));
}
else if (dateorder == DateOrder.DMY)
{
int year = Convert.ToInt32(values[2]);
if (values[2].Length <= 2 && year < 100)
{
year = GlobalizationHelper.ToFourDigitYear(year);
}
candidate_value = new DateTime(year,
Convert.ToInt32(values[1]),
Convert.ToInt32(values[0]));
}
else if (dateorder == DateOrder.MDY)
{
int year = Convert.ToInt32(values[2]);
if (values[2].Length <= 2 && year < 100)
{
year = GlobalizationHelper.ToFourDigitYear(year);
}
candidate_value = new DateTime(year,
Convert.ToInt32(values[0]),
Convert.ToInt32(values[1]));
}
else if (dateorder == DateOrder.YMD)
{
int year = Convert.ToInt32(values[0]);
if (values[0].Length <= 2 && year < 100)
{
year = GlobalizationHelper.ToFourDigitYear(year);
}
candidate_value = new DateTime(year,
Convert.ToInt32(values[1]),
Convert.ToInt32(values[2]));
}
#endregion
if (candidate_value == null)
{
return(trimtext);
}
return(candidate_value.Value.ToShortDateString());
}
catch (Exception)
{
return(trimtext);
}
} // end of method