DateTime.ToString Method (System) (original) (raw)
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Converts the value of the current DateTime object to its equivalent string representation using the specified format and culture-specific format information.
public:
virtual System::String ^ ToString(System::String ^ format, IFormatProvider ^ provider);public string ToString(string format, IFormatProvider provider);public string ToString(string? format, IFormatProvider? provider);override this.ToString : string * IFormatProvider -> stringPublic Function ToString (format As String, provider As IFormatProvider) As StringParameters
format
A standard or custom date and time format string.
provider
An object that supplies culture-specific formatting information.
Returns
A string representation of value of the current DateTime object as specified by format and provider.
Implements
Exceptions
The length of format is 1, and it is not one of the format specifier characters defined for DateTimeFormatInfo.
-or-
format does not contain a valid custom format pattern.
The date and time is outside the range of dates supported by the calendar used by provider.
Examples
The following example uses each of the standard date time format strings to display the string representation of a date and time for four different cultures.
using System;
using System.Globalization;
public class ToStringExample4
{
public static void Main1()
{
// Create an array of all supported standard date and time format specifiers.
string[] formats = {"d", "D", "f", "F", "g", "G", "m", "o", "r",
"s", "t", "T", "u", "U", "Y"};
// Create an array of four cultures.
CultureInfo[] cultures = {CultureInfo.GetCultureInfo("de-DE"),
CultureInfo.GetCultureInfo("en-US"),
CultureInfo.GetCultureInfo("es-ES"),
CultureInfo.GetCultureInfo("fr-FR")};
// Define date to be displayed.
DateTime dateToDisplay = new DateTime(2008, 10, 31, 17, 4, 32);
// Iterate each standard format specifier.
foreach (string formatSpecifier in formats)
{
foreach (CultureInfo culture in cultures)
Console.WriteLine("{0} Format Specifier {1, 10} Culture {2, 40}",
formatSpecifier, culture.Name,
dateToDisplay.ToString(formatSpecifier, culture));
Console.WriteLine();
}
}
}
// The example displays the following output:
// d Format Specifier de-DE Culture 31.10.2008
// d Format Specifier en-US Culture 10/31/2008
// d Format Specifier es-ES Culture 31/10/2008
// d Format Specifier fr-FR Culture 31/10/2008
//
// D Format Specifier de-DE Culture Freitag, 31. Oktober 2008
// D Format Specifier en-US Culture Friday, October 31, 2008
// D Format Specifier es-ES Culture viernes, 31 de octubre de 2008
// D Format Specifier fr-FR Culture vendredi 31 octobre 2008
//
// f Format Specifier de-DE Culture Freitag, 31. Oktober 2008 17:04
// f Format Specifier en-US Culture Friday, October 31, 2008 5:04 PM
// f Format Specifier es-ES Culture viernes, 31 de octubre de 2008 17:04
// f Format Specifier fr-FR Culture vendredi 31 octobre 2008 17:04
//
// F Format Specifier de-DE Culture Freitag, 31. Oktober 2008 17:04:32
// F Format Specifier en-US Culture Friday, October 31, 2008 5:04:32 PM
// F Format Specifier es-ES Culture viernes, 31 de octubre de 2008 17:04:32
// F Format Specifier fr-FR Culture vendredi 31 octobre 2008 17:04:32
//
// g Format Specifier de-DE Culture 31.10.2008 17:04
// g Format Specifier en-US Culture 10/31/2008 5:04 PM
// g Format Specifier es-ES Culture 31/10/2008 17:04
// g Format Specifier fr-FR Culture 31/10/2008 17:04
//
// G Format Specifier de-DE Culture 31.10.2008 17:04:32
// G Format Specifier en-US Culture 10/31/2008 5:04:32 PM
// G Format Specifier es-ES Culture 31/10/2008 17:04:32
// G Format Specifier fr-FR Culture 31/10/2008 17:04:32
//
// m Format Specifier de-DE Culture 31. Oktober
// m Format Specifier en-US Culture October 31
// m Format Specifier es-ES Culture 31 de octubre
// m Format Specifier fr-FR Culture 31 octobre
//
// o Format Specifier de-DE Culture 2008-10-31T17:04:32.0000000
// o Format Specifier en-US Culture 2008-10-31T17:04:32.0000000
// o Format Specifier es-ES Culture 2008-10-31T17:04:32.0000000
// o Format Specifier fr-FR Culture 2008-10-31T17:04:32.0000000
//
// r Format Specifier de-DE Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier en-US Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier es-ES Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier fr-FR Culture Fri, 31 Oct 2008 17:04:32 GMT
//
// s Format Specifier de-DE Culture 2008-10-31T17:04:32
// s Format Specifier en-US Culture 2008-10-31T17:04:32
// s Format Specifier es-ES Culture 2008-10-31T17:04:32
// s Format Specifier fr-FR Culture 2008-10-31T17:04:32
//
// t Format Specifier de-DE Culture 17:04
// t Format Specifier en-US Culture 5:04 PM
// t Format Specifier es-ES Culture 17:04
// t Format Specifier fr-FR Culture 17:04
//
// T Format Specifier de-DE Culture 17:04:32
// T Format Specifier en-US Culture 5:04:32 PM
// T Format Specifier es-ES Culture 17:04:32
// T Format Specifier fr-FR Culture 17:04:32
//
// u Format Specifier de-DE Culture 2008-10-31 17:04:32Z
// u Format Specifier en-US Culture 2008-10-31 17:04:32Z
// u Format Specifier es-ES Culture 2008-10-31 17:04:32Z
// u Format Specifier fr-FR Culture 2008-10-31 17:04:32Z
//
// U Format Specifier de-DE Culture Freitag, 31. Oktober 2008 09:04:32
// U Format Specifier en-US Culture Friday, October 31, 2008 9:04:32 AM
// U Format Specifier es-ES Culture viernes, 31 de octubre de 2008 9:04:32
// U Format Specifier fr-FR Culture vendredi 31 octobre 2008 09:04:32
//
// Y Format Specifier de-DE Culture Oktober 2008
// Y Format Specifier en-US Culture October 2008
// Y Format Specifier es-ES Culture octubre de 2008
// Y Format Specifier fr-FR Culture octobre 2008
open System
open System.Globalization
// Create a list of all supported standard date and time format specifiers.
let formats =
[ "d"; "D"; "f"; "F"; "g"; "G"; "m"; "o"
"r"; "s"; "t"; "T"; "u"; "U"; "Y" ]
// Create a list of four cultures.
let cultures =
[ CultureInfo.GetCultureInfo "de-DE"
CultureInfo.GetCultureInfo "en-US"
CultureInfo.GetCultureInfo "es-ES"
CultureInfo.GetCultureInfo "fr-FR" ]
// Define date to be displayed.
let dateToDisplay = DateTime(2008, 10, 31, 17, 4, 32)
// Iterate each standard format specifier.
for formatSpecifier in formats do
for culture in cultures do
printfn $"{formatSpecifier} Format Specifier {culture.Name, 10} Culture {dateToDisplay.ToString(formatSpecifier, culture), 40}"
printfn ""
// The example displays the following output:
// d Format Specifier de-DE Culture 31.10.2008
// d Format Specifier en-US Culture 10/31/2008
// d Format Specifier es-ES Culture 31/10/2008
// d Format Specifier fr-FR Culture 31/10/2008
//
// D Format Specifier de-DE Culture Freitag, 31. Oktober 2008
// D Format Specifier en-US Culture Friday, October 31, 2008
// D Format Specifier es-ES Culture viernes, 31 de octubre de 2008
// D Format Specifier fr-FR Culture vendredi 31 octobre 2008
//
// f Format Specifier de-DE Culture Freitag, 31. Oktober 2008 17:04
// f Format Specifier en-US Culture Friday, October 31, 2008 5:04 PM
// f Format Specifier es-ES Culture viernes, 31 de octubre de 2008 17:04
// f Format Specifier fr-FR Culture vendredi 31 octobre 2008 17:04
//
// F Format Specifier de-DE Culture Freitag, 31. Oktober 2008 17:04:32
// F Format Specifier en-US Culture Friday, October 31, 2008 5:04:32 PM
// F Format Specifier es-ES Culture viernes, 31 de octubre de 2008 17:04:32
// F Format Specifier fr-FR Culture vendredi 31 octobre 2008 17:04:32
//
// g Format Specifier de-DE Culture 31.10.2008 17:04
// g Format Specifier en-US Culture 10/31/2008 5:04 PM
// g Format Specifier es-ES Culture 31/10/2008 17:04
// g Format Specifier fr-FR Culture 31/10/2008 17:04
//
// G Format Specifier de-DE Culture 31.10.2008 17:04:32
// G Format Specifier en-US Culture 10/31/2008 5:04:32 PM
// G Format Specifier es-ES Culture 31/10/2008 17:04:32
// G Format Specifier fr-FR Culture 31/10/2008 17:04:32
//
// m Format Specifier de-DE Culture 31. Oktober
// m Format Specifier en-US Culture October 31
// m Format Specifier es-ES Culture 31 de octubre
// m Format Specifier fr-FR Culture 31 octobre
//
// o Format Specifier de-DE Culture 2008-10-31T17:04:32.0000000
// o Format Specifier en-US Culture 2008-10-31T17:04:32.0000000
// o Format Specifier es-ES Culture 2008-10-31T17:04:32.0000000
// o Format Specifier fr-FR Culture 2008-10-31T17:04:32.0000000
//
// r Format Specifier de-DE Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier en-US Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier es-ES Culture Fri, 31 Oct 2008 17:04:32 GMT
// r Format Specifier fr-FR Culture Fri, 31 Oct 2008 17:04:32 GMT
//
// s Format Specifier de-DE Culture 2008-10-31T17:04:32
// s Format Specifier en-US Culture 2008-10-31T17:04:32
// s Format Specifier es-ES Culture 2008-10-31T17:04:32
// s Format Specifier fr-FR Culture 2008-10-31T17:04:32
//
// t Format Specifier de-DE Culture 17:04
// t Format Specifier en-US Culture 5:04 PM
// t Format Specifier es-ES Culture 17:04
// t Format Specifier fr-FR Culture 17:04
//
// T Format Specifier de-DE Culture 17:04:32
// T Format Specifier en-US Culture 5:04:32 PM
// T Format Specifier es-ES Culture 17:04:32
// T Format Specifier fr-FR Culture 17:04:32
//
// u Format Specifier de-DE Culture 2008-10-31 17:04:32Z
// u Format Specifier en-US Culture 2008-10-31 17:04:32Z
// u Format Specifier es-ES Culture 2008-10-31 17:04:32Z
// u Format Specifier fr-FR Culture 2008-10-31 17:04:32Z
//
// U Format Specifier de-DE Culture Freitag, 31. Oktober 2008 09:04:32
// U Format Specifier en-US Culture Friday, October 31, 2008 9:04:32 AM
// U Format Specifier es-ES Culture viernes, 31 de octubre de 2008 9:04:32
// U Format Specifier fr-FR Culture vendredi 31 octobre 2008 09:04:32
//
// Y Format Specifier de-DE Culture Oktober 2008
// Y Format Specifier en-US Culture October 2008
// Y Format Specifier es-ES Culture octubre de 2008
// Y Format Specifier fr-FR Culture octobre 2008
Imports System.Globalization
Module Example
Public Sub Main4()
' Create an array of all supported standard date and time format specifiers.
Dim formats() As String = {"d", "D", "f", "F", "g", "G", "m", "o", "r",
"s", "t", "T", "u", "U", "Y"}
' Create an array of four cultures.
Dim cultures() As CultureInfo = {CultureInfo.GetCultureInfo("de-DE"),
CultureInfo.GetCultureInfo("en-US"),
CultureInfo.GetCultureInfo("es-ES"),
CultureInfo.GetCultureInfo("fr-FR")}
' Define date to be displayed.
Dim dateToDisplay As Date = #10/1/2008 17:04:32#
' Iterate each standard format specifier.
For Each formatSpecifier As String In formats
For Each culture As CultureInfo In cultures
Console.WriteLine("{0} Format Specifier {1, 10} Culture {2, 40}",
formatSpecifier, culture.Name,
dateToDisplay.ToString(formatSpecifier, culture))
Next
Console.WriteLine()
Next
End Sub
End Module
' The example displays the following output:
' d Format Specifier de-DE Culture 01.10.2008
' d Format Specifier en-US Culture 10/1/2008
' d Format Specifier es-ES Culture 01/10/2008
' d Format Specifier fr-FR Culture 01/10/2008
'
' D Format Specifier de-DE Culture Mittwoch, 1. Oktober 2008
' D Format Specifier en-US Culture Wednesday, October 01, 2008
' D Format Specifier es-ES Culture miércoles, 01 de octubre de 2008
' D Format Specifier fr-FR Culture mercredi 1 octobre 2008
'
' f Format Specifier de-DE Culture Mittwoch, 1. Oktober 2008 17:04
' f Format Specifier en-US Culture Wednesday, October 01, 2008 5:04 PM
' f Format Specifier es-ES Culture miércoles, 01 de octubre de 2008 17:04
' f Format Specifier fr-FR Culture mercredi 1 octobre 2008 17:04
'
' F Format Specifier de-DE Culture Mittwoch, 1. Oktober 2008 17:04:32
' F Format Specifier en-US Culture Wednesday, October 01, 2008 5:04:32 PM
' F Format Specifier es-ES Culture miércoles, 01 de octubre de 2008 17:04:3
' F Format Specifier fr-FR Culture mercredi 1 octobre 2008 17:04:32
'
' g Format Specifier de-DE Culture 01.10.2008 17:04
' g Format Specifier en-US Culture 10/1/2008 5:04 PM
' g Format Specifier es-ES Culture 01/10/2008 17:04
' g Format Specifier fr-FR Culture 01/10/2008 17:04
'
' G Format Specifier de-DE Culture 01.10.2008 17:04:32
' G Format Specifier en-US Culture 10/1/2008 5:04:32 PM
' G Format Specifier es-ES Culture 01/10/2008 17:04:32
' G Format Specifier fr-FR Culture 01/10/2008 17:04:32
'
' m Format Specifier de-DE Culture 01 Oktober
' m Format Specifier en-US Culture October 01
' m Format Specifier es-ES Culture 01 octubre
' m Format Specifier fr-FR Culture 1 octobre
'
' o Format Specifier de-DE Culture 2008-10-01T17:04:32.0000000
' o Format Specifier en-US Culture 2008-10-01T17:04:32.0000000
' o Format Specifier es-ES Culture 2008-10-01T17:04:32.0000000
' o Format Specifier fr-FR Culture 2008-10-01T17:04:32.0000000
'
' r Format Specifier de-DE Culture Wed, 01 Oct 2008 17:04:32 GMT
' r Format Specifier en-US Culture Wed, 01 Oct 2008 17:04:32 GMT
' r Format Specifier es-ES Culture Wed, 01 Oct 2008 17:04:32 GMT
' r Format Specifier fr-FR Culture Wed, 01 Oct 2008 17:04:32 GMT
'
' s Format Specifier de-DE Culture 2008-10-01T17:04:32
' s Format Specifier en-US Culture 2008-10-01T17:04:32
' s Format Specifier es-ES Culture 2008-10-01T17:04:32
' s Format Specifier fr-FR Culture 2008-10-01T17:04:32
'
' t Format Specifier de-DE Culture 17:04
' t Format Specifier en-US Culture 5:04 PM
' t Format Specifier es-ES Culture 17:04
' t Format Specifier fr-FR Culture 17:04
'
' T Format Specifier de-DE Culture 17:04:32
' T Format Specifier en-US Culture 5:04:32 PM
' T Format Specifier es-ES Culture 17:04:32
' T Format Specifier fr-FR Culture 17:04:32
'
' u Format Specifier de-DE Culture 2008-10-01 17:04:32Z
' u Format Specifier en-US Culture 2008-10-01 17:04:32Z
' u Format Specifier es-ES Culture 2008-10-01 17:04:32Z
' u Format Specifier fr-FR Culture 2008-10-01 17:04:32Z
'
' U Format Specifier de-DE Culture Donnerstag, 2. Oktober 2008 00:04:32
' U Format Specifier en-US Culture Thursday, October 02, 2008 12:04:32 AM
' U Format Specifier es-ES Culture jueves, 02 de octubre de 2008 0:04:32
' U Format Specifier fr-FR Culture jeudi 2 octobre 2008 00:04:32
'
' Y Format Specifier de-DE Culture Oktober 2008
' Y Format Specifier en-US Culture October, 2008
' Y Format Specifier es-ES Culture octubre de 2008
' Y Format Specifier fr-FR Culture octobre 2008
The following example demonstrates different ways of formatting a DateTime value using the invariant DateTimeFormatInfo.
open System
open System.Globalization
let dt = DateTime.Now
let formats =
[ "d"; "D"
"f"; "F"
"g"; "G"
"m"
"r"
"s"
"t"; "T"
"u"; "U"
"y"
"dddd, MMMM dd yyyy"
"ddd, MMM d \"'\"yy"
"dddd, MMMM dd"
"M/yy"
"dd-MM-yy" ]
for format in formats do
let date = dt.ToString(format, DateTimeFormatInfo.InvariantInfo)
printfn $"{format}: {date}"
// Output.
// d: 08/17/2000
// D: Thursday, August 17, 2000
// f: Thursday, August 17, 2000 16:32
// F: Thursday, August 17, 2000 16:32:32
// g: 08/17/2000 16:32
// G: 08/17/2000 16:32:32
// m: August 17
// r: Thu, 17 Aug 2000 23:32:32 GMT
// s: 2000-08-17T16:32:32
// t: 16:32
// T: 16:32:32
// u: 2000-08-17 23:32:32Z
// U: Thursday, August 17, 2000 23:32:32
// y: August, 2000
// dddd, MMMM dd yyyy: Thursday, August 17 2000
// ddd, MMM d "'"yy: Thu, Aug 17 '00
// dddd, MMMM dd: Thursday, August 17
// M/yy: 8/00
// dd-MM-yy: 17-08-00
using System;
using System.Globalization;
public class MainClass
{
public static void Main(string[] args)
{
DateTime dt = DateTime.Now;
String[] format = {
"d", "D",
"f", "F",
"g", "G",
"m",
"r",
"s",
"t", "T",
"u", "U",
"y",
"dddd, MMMM dd yyyy",
"ddd, MMM d \"'\"yy",
"dddd, MMMM dd",
"M/yy",
"dd-MM-yy",
};
string date;
for (int i = 0; i < format.Length; i++)
{
date = dt.ToString(format[i], DateTimeFormatInfo.InvariantInfo);
Console.WriteLine(string.Concat(format[i], " :", date));
}
/** Output.
*
* d :08/17/2000
* D :Thursday, August 17, 2000
* f :Thursday, August 17, 2000 16:32
* F :Thursday, August 17, 2000 16:32:32
* g :08/17/2000 16:32
* G :08/17/2000 16:32:32
* m :August 17
* r :Thu, 17 Aug 2000 23:32:32 GMT
* s :2000-08-17T16:32:32
* t :16:32
* T :16:32:32
* u :2000-08-17 23:32:32Z
* U :Thursday, August 17, 2000 23:32:32
* y :August, 2000
* dddd, MMMM dd yyyy :Thursday, August 17 2000
* ddd, MMM d "'"yy :Thu, Aug 17 '00
* dddd, MMMM dd :Thursday, August 17
* M/yy :8/00
* dd-MM-yy :17-08-00
*/
}
}
Option Explicit
Option Strict
Imports System.Globalization
Public Class MainClass
Public Shared Sub Main()
Dim dt As DateTime = DateTime.Now
Dim myformat() As String = {"d", "D", _
"f", "F", _
"g", "G", _
"m", _
"r", _
"s", _
"t", "T", _
"u", "U", _
"y", _
"dddd, MMMM dd yyyy", _
"ddd, MMM d ""'""yy", _
"dddd, MMMM dd", _
"M/yy", _
"dd-MM-yy"}
Dim mydate As String
Dim i As Integer
For i = 0 To myformat.Length - 1
mydate = dt.ToString(myformat(i), DateTimeFormatInfo.InvariantInfo)
Console.WriteLine(String.Concat(myformat(i), " :", mydate))
Next i
' Output.
'
' d :08/17/2000
' D :Thursday, August 17, 2000
' f :Thursday, August 17, 2000 16:32
' F :Thursday, August 17, 2000 16:32:32
' g :08/17/2000 16:32
' G :08/17/2000 16:32:32
' m :August 17
' r :Thu, 17 Aug 2000 23:32:32 GMT
' s :2000-08-17T16:32:32
' t :16:32
' T :16:32:32
' u :2000-08-17 23:32:32Z
' U :Thursday, August 17, 2000 23:32:32
' y :August, 2000
' dddd, MMMM dd yyyy :Thursday, August 17 2000
' ddd, MMM d "'"yy :Thu, Aug 17 '00
' dddd, MMMM dd :Thursday, August 17
' M/yy :8/00
' dd-MM-yy :17-08-00
End Sub
End Class
Remarks
The format parameter can contain either a single format specifier character (see Standard Date and Time Format Strings) or a custom format pattern (see Custom Date and Time Format Strings). If format is null or an empty string (""), the standard format specifier, "G", is used.
The provider parameter defines the pattern that corresponds to the standard format specifiers, as well as the symbols and names of date and time components. The provider parameter can be any of the following:
- A CultureInfo object that represents the culture whose formatting conventions are to be reflected in the returned string. The DateTimeFormatInfo object returned by the CultureInfo.DateTimeFormat property defines the formatting of the returned string.
- A DateTimeFormatInfo object that defines the format of date and time data.
- A custom object that implements the IFormatProvider interface. Its GetFormat method returns a DateTimeFormatInfo object that provides formatting information.
If provider is null, the DateTimeFormatInfo associated with the current culture is used. For more information, see CultureInfo.CurrentCulture.
Notes to Callers
The ToString(String, IFormatProvider) method returns the string representation of the date and time in the calendar used by the provider parameter. Its calendar is defined by the Calendar property. If the value of the current DateTime instance is earlier than MinSupportedDateTime or later than MaxSupportedDateTime, the method throws an ArgumentOutOfRangeException. The following example provides an illustration. It attempts to format a date that is outside the range of the UmAlQuraCalendar class.
using System;
using System.Globalization;
public class Example4
{
public static void Main()
{
CultureInfo arSA = new CultureInfo("ar-SA");
arSA.DateTimeFormat.Calendar = new UmAlQuraCalendar();
DateTime date1 = new DateTime(1890, 9, 10);
try
{
Console.WriteLine(date1.ToString("d", arSA));
}
catch (ArgumentOutOfRangeException)
{
Console.WriteLine("{0:d} is earlier than {1:d} or later than {2:d}",
date1,
arSA.DateTimeFormat.Calendar.MinSupportedDateTime,
arSA.DateTimeFormat.Calendar.MaxSupportedDateTime);
}
}
}
// The example displays the following output:
// 9/10/1890 is earlier than 4/30/1900 or later than 5/13/2029
open System
open System.Globalization
let arSA = CultureInfo "ar-SA"
arSA.DateTimeFormat.Calendar <- UmAlQuraCalendar()
let date1 = DateTime(1890, 9, 10)
try
date1.ToString("d", arSA)
|> printfn "%s"
with :? ArgumentOutOfRangeException ->
printfn $"{date1:d} is earlier than {arSA.DateTimeFormat.Calendar.MinSupportedDateTime:d} or later than {arSA.DateTimeFormat.Calendar.MaxSupportedDateTime:d}"
// The example displays the following output:
// 9/10/1890 is earlier than 4/30/1900 or later than 5/13/2029
Imports System.Globalization
Module Example
Public Sub Main()
Dim arSA As New CultureInfo("ar-SA")
arSA.DateTimeFormat.Calendar = New UmAlQuraCalendar()
Dim date1 As Date = #09/10/1890#
Try
Console.WriteLine(date1.ToString("d", arSA))
Catch e As ArgumentOutOfRangeException
Console.WriteLine("{0:d} is earlier than {1:d} or later than {2:d}", _
date1, _
arSA.DateTimeFormat.Calendar.MinSupportedDateTime, _
arSA.DateTimeFormat.Calendar.MaxSupportedDateTime)
End Try
End Sub
End Module
' The example displays the following output:
' 9/10/1890 is earlier than 4/30/1900 or later than 5/13/2029
See also
- DateTimeFormatInfo
- CultureInfo
- Formatting Types in .NET
- Standard Date and Time Format Strings
- Custom Date and Time Format Strings
- Sample: .NET Core WinForms Formatting Utility (C#)
- Sample: .NET Core WinForms Formatting Utility (Visual Basic)