Convert.ToDateTime Metoda

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(float value);

public static DateTime ToDateTime (float value);

static member ToDateTime : single -> DateTime

Public Shared Function ToDateTime (value As Single) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Single

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::String ^ value);

public static DateTime ToDateTime (string value);

public static DateTime ToDateTime (string? value);

static member ToDateTime : string -> DateTime

Public Shared Function ToDateTime (value As String) As DateTime

Parametry

Návraty

Ekvivalent data a času hodnoty value, nebo ekvivalent data a času DateTime.MinValue , pokud value je null.

Výjimky

Příklady

Následující příklad používá metodu k převodu ToDateTime různých řetězcových reprezentací kalendářních dat a časů na DateTime hodnoty.

using System;

public class ConversionToDateTime
{
   public static void Main()
   {
      string dateString = null;

      // Convert a null string.
      ConvertToDateTime(dateString);

      // Convert an empty string.
      dateString = String.Empty;
      ConvertToDateTime(dateString);

      // Convert a non-date string.
      dateString = "not a date";
      ConvertToDateTime(dateString);

      // Try to convert various date strings.
      dateString = "05/01/1996";
      ConvertToDateTime(dateString);
      dateString = "Tue Apr 28, 2009";
      ConvertToDateTime(dateString);
      dateString = "Wed Apr 28, 2009";
      ConvertToDateTime(dateString);
      dateString = "06 July 2008 7:32:47 AM";
      ConvertToDateTime(dateString);
      dateString = "17:32:47.003";
      ConvertToDateTime(dateString);
      // Convert a string returned by DateTime.ToString("R").
      dateString = "Sat, 10 May 2008 14:32:17 GMT";
      ConvertToDateTime(dateString);
      // Convert a string returned by DateTime.ToString("o").
      dateString = "2009-05-01T07:54:59.9843750-04:00";
      ConvertToDateTime(dateString);
   }

   private static void ConvertToDateTime(string value)
   {
      DateTime convertedDate;
      try {
         convertedDate = Convert.ToDateTime(value);
         Console.WriteLine("'{0}' converts to {1} {2} time.",
                           value, convertedDate,
                           convertedDate.Kind.ToString());
      }
      catch (FormatException) {
         Console.WriteLine("'{0}' is not in the proper format.", value);
      }
   }
}
// The example displays the following output:
//    '' converts to 1/1/0001 12:00:00 AM Unspecified time.
//    '' is not in the proper format.
//    'not a date' is not in the proper format.
//    '05/01/1996' converts to 5/1/1996 12:00:00 AM Unspecified time.
//    'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM Unspecified time.
//    'Wed Apr 28, 2009' is not in the proper format.
//    '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM Unspecified time.
//    '17:32:47.003' converts to 5/30/2008 5:32:47 PM Unspecified time.
//    'Sat, 10 May 2008 14:32:17 GMT' converts to 5/10/2008 7:32:17 AM Local time.
//    '2009-05-01T07:54:59.9843750-04:00' converts to 5/1/2009 4:54:59 AM Local time.

open System

let convertToDateTime (value: string) =
    try
        let convertedDate = Convert.ToDateTime value
        printfn $"'{value}' converts to {convertedDate} {convertedDate.Kind} time."
    with :?FormatException ->
        printfn $"'{value}' is not in the proper format."

[<EntryPoint>]
let main _ =
    let dateString = null

    // Convert a null string.
    convertToDateTime dateString

    // Convert an empty string.
    let dateString = String.Empty
    convertToDateTime dateString

    // Convert a non-date string.
    let dateString = "not a date"
    convertToDateTime dateString

    // Try to convert various date strings.
    let dateString = "05/01/1996"
    convertToDateTime dateString
    let dateString = "Tue Apr 28, 2009"
    convertToDateTime dateString
    let dateString = "Wed Apr 28, 2009"
    convertToDateTime dateString
    let dateString = "06 July 2008 7:32:47 AM"
    convertToDateTime dateString
    let dateString = "17:32:47.003"
    convertToDateTime dateString
    // Convert a string returned by DateTime.ToString("R").
    let dateString = "Sat, 10 May 2008 14:32:17 GMT"
    convertToDateTime dateString
    // Convert a string returned by DateTime.ToString("o").
    let dateString = "2009-05-01T07:54:59.9843750-04:00"
    convertToDateTime dateString

    0

// The example displays the following output:
//    '' converts to 1/1/0001 12:00:00 AM Unspecified time.
//    '' is not in the proper format.
//    'not a date' is not in the proper format.
//    '05/01/1996' converts to 5/1/1996 12:00:00 AM Unspecified time.
//    'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM Unspecified time.
//    'Wed Apr 28, 2009' is not in the proper format.
//    '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM Unspecified time.
//    '17:32:47.003' converts to 5/30/2008 5:32:47 PM Unspecified time.
//    'Sat, 10 May 2008 14:32:17 GMT' converts to 5/10/2008 7:32:17 AM Local time.
//    '2009-05-01T07:54:59.9843750-04:00' converts to 5/1/2009 4:54:59 AM Local time.

Module ConversionToDateTime
   Public Sub Main()
      Dim dateString As String = Nothing
      
      ' Convert a null string.
      ConvertToDateTime(dateString)
      
      ' Convert an empty string.
      dateString = String.Empty
      ConvertToDateTime(dateString)
      
      ' Convert a non-date string.
      dateString = "not a date"
      ConvertToDateTime(dateString)
      
      ' Try to convert various date strings.
      dateString = "05/01/1996"
      ConvertToDateTime(dateString)
      dateString = "Tue Apr 28, 2009"
      ConvertToDateTime(dateString)
      dateString = "Wed Apr 28, 2009"
      ConvertToDateTime(dateString)
      dateString = "06 July 2008 7:32:47 AM"
      ConvertToDateTime(dateString)
      dateString = "17:32:47.003"
      ConvertToDateTime(dateString)
      ' Convert a string returned by DateTime.ToString("R").
      dateString = "Sat, 10 May 2008 14:32:17 GMT"
      ConvertToDateTime(dateString)
      ' Convert a string returned by DateTime.ToString("o")
      dateString = "2009-05-01T07:54:59.9843750-04:00"
      ConvertToDateTime(dateString)
   End Sub
   
   Private Sub ConvertToDateTime(value As String)
      Dim convertedDate As Date
      Try
         convertedDate = Convert.ToDateTime(value)
         Console.WriteLine("'{0}' converts to {1}.", value, convertedDate)
      Catch e As FormatException
         Console.WriteLine("'{0}' is not in the proper format.", value)
      End Try
   End Sub
End Module
' The example displays the following output:
'    '' converts to 1/1/0001 12:00:00 AM.
'    '' is not in the proper format.
'    'not a date' is not in the proper format.
'    '05/01/1996' converts to 5/1/1996 12:00:00 AM.
'    'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM.
'    'Wed Apr 28, 2009' is not in the proper format.
'    '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM.
'    '17:32:47.003' converts to 5/30/2008 5:32:47 PM.
'    'Sat, 10 May 2008 14:32:17 GMT' converts to 5/10/2008 7:32:17 AM.
'    '2009-05-01T07:54:59.9843750-04:00' converts to 5/1/2009 4:54:59 AM.

Poznámky

Pokud value není null, návratová hodnota je výsledkem vyvolání DateTime.Parse metody value při použití informací o formátování v objektu DateTimeFormatInfo , který je inicializován pro aktuální jazykovou verzi. Argument value musí obsahovat reprezentaci data a času v jednom z formátů popsaných DateTimeFormatInfo v tématu. Pokud value je null, vrátí DateTime.MinValuemetoda .

Tato metoda se pokusí úplně parsovat value a vyhnout se vyvolání FormatException. Doplní chybějící informace o měsíci, dni a roce s aktuálním datem. Pokud value obsahuje pouze datum a žádný čas, tato metoda předpokládá čas půlnoci. Všechny počáteční, vnitřní nebo koncové prázdné znaky se value ignorují.

Pokud nechcete zpracovávat výjimku v případě selhání převodu, můžete místo toho volat metodu DateTime.TryParse . Vrátí Boolean hodnotu, která označuje, zda byl převod úspěšný nebo neúspěšný.

Viz také

• CurrentCulture
• Analýza řetězců data a času v .NET

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::UInt16 value);

[System.CLSCompliant(false)]
public static DateTime ToDateTime (ushort value);

[<System.CLSCompliant(false)>]
static member ToDateTime : uint16 -> DateTime

Public Shared Function ToDateTime (value As UShort) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Atributy

CLSCompliantAttribute

Výjimky

Viz také

• UInt16

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::String ^ value, IFormatProvider ^ provider);

public static DateTime ToDateTime (string value, IFormatProvider provider);

public static DateTime ToDateTime (string? value, IFormatProvider? provider);

static member ToDateTime : string * IFormatProvider -> DateTime

Public Shared Function ToDateTime (value As String, provider As IFormatProvider) As DateTime

Parametry

Návraty

Ekvivalent data a času hodnoty value, nebo ekvivalent data a času DateTime.MinValue , pokud value je null.

Výjimky

Příklady

Následující příklad převede řetězcové reprezentace hodnot kalendářních dat pomocí ToDateTime metody pomocí objektu IFormatProvider .

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      Console.WriteLine("{0,-18}{1,-12}{2}\n", "Date String", "Culture", "Result");

      string[] cultureNames = { "en-US", "ru-RU","ja-JP" };
      string[] dateStrings = { "01/02/09", "2009/02/03",  "01/2009/03",
                               "01/02/2009", "21/02/09", "01/22/09",
                               "01/02/23" };
      // Iterate each culture name in the array.
      foreach (string cultureName in cultureNames)
      {
         CultureInfo culture = new CultureInfo(cultureName);

         // Parse each date using the designated culture.
         foreach (string dateStr in dateStrings)
         {
            DateTime dateTimeValue;
            try {
               dateTimeValue = Convert.ToDateTime(dateStr, culture);
                // Display the date and time in a fixed format.
                Console.WriteLine("{0,-18}{1,-12}{2:yyyy-MMM-dd}",
                                  dateStr, cultureName, dateTimeValue);
            }
            catch (FormatException e) {
                Console.WriteLine("{0,-18}{1,-12}{2}",
                                  dateStr, cultureName, e.GetType().Name);
            }
         }
         Console.WriteLine();
      }
   }
}

open System
open System.Globalization

printfn $"""{"Date String",-18}{"Culture",-12}{"Result"}\n"""

let cultureNames = [ "en-US"; "ru-RU"; "ja-JP" ]
let dateStrings =
    [ "01/02/09"; "2009/02/03"; "01/2009/03"
      "01/02/2009"; "21/02/09"; "01/22/09"; "01/02/23" ]
// Iterate each culture name in the array.
for cultureName in cultureNames do
    let culture = CultureInfo cultureName

    // Parse each date using the designated culture.
    for dateStr in dateStrings do
        try
            let dateTimeValue = Convert.ToDateTime(dateStr, culture)
            // Display the date and time in a fixed format.
            printfn $"""{dateStr,-18}{cultureName,-12}{dateTimeValue.ToString "yyyy-MMM-dd"}"""
        with :? FormatException as e ->
            printfn $"{dateStr,-18}{cultureName,-12}{e.GetType().Name}"
    printfn ""

Imports System.Globalization

Module Example
   Public Sub Main( )
      Console.WriteLine("{0,-18}{1,-12}{2}", "Date String", "Culture", "Result")
      Console.WriteLine()

      Dim cultureNames() As String = { "en-US", "ru-RU","ja-JP" }
      Dim dateStrings() As String = { "01/02/09", "2009/02/03",  "01/2009/03", _
                                      "01/02/2009", "21/02/09", "01/22/09",   _
                                      "01/02/23" }
      ' Iterate each culture name in the array.
      For Each cultureName As String In cultureNames
         Dim culture As CultureInfo = New CultureInfo(cultureName)
        
         ' Parse each date using the designated culture.
         For Each dateStr As String In dateStrings
            Dim dateTimeValue As DateTime
            Try
               dateTimeValue = Convert.ToDateTime(dateStr, culture)
                ' Display the date and time in a fixed format.
                Console.WriteLine("{0,-18}{1,-12}{2:yyyy-MMM-dd}", _
                                  dateStr, cultureName, dateTimeValue)
            Catch e As FormatException 
                Console.WriteLine("{0,-18}{1,-12}{2}", _
                                  dateStr, cultureName, e.GetType().Name)
            End Try            
         Next
         Console.WriteLine()
      Next
   End Sub 
End Module 
' The example displays the following output:
'       Date String       Culture     Result
'       
'       01/02/09          en-US       2009-Jan-02
'       2009/02/03        en-US       2009-Feb-03
'       01/2009/03        en-US       2009-Jan-03
'       01/02/2009        en-US       2009-Jan-02
'       21/02/09          en-US       FormatException
'       01/22/09          en-US       2009-Jan-22
'       01/02/23          en-US       2023-Jan-02
'       
'       01/02/09          ru-RU       2009-Feb-01
'       2009/02/03        ru-RU       2009-Feb-03
'       01/2009/03        ru-RU       2009-Jan-03
'       01/02/2009        ru-RU       2009-Feb-01
'       21/02/09          ru-RU       2009-Feb-21
'       01/22/09          ru-RU       FormatException
'       01/02/23          ru-RU       2023-Feb-01
'       
'       01/02/09          ja-JP       2001-Feb-09
'       2009/02/03        ja-JP       2009-Feb-03
'       01/2009/03        ja-JP       2009-Jan-03
'       01/02/2009        ja-JP       2009-Jan-02
'       21/02/09          ja-JP       2021-Feb-09
'       01/22/09          ja-JP       FormatException
'       01/02/23          ja-JP       2001-Feb-23

Poznámky

Návratová hodnota je výsledkem vyvolání metody na DateTime.Parse(String, IFormatProvider)value.

provider IFormatProvider je instance, která získá DateTimeFormatInfo objekt. Objekt DateTimeFormatInfo poskytuje informace specifické pro jazykovou verzi valueformátu . Pokud provider je null, použije se DateTimeFormatInfo pro aktuální jazykovou verzi.

Pokud nechcete zpracovávat výjimku v případě selhání převodu, můžete místo toho volat metodu DateTime.TryParse . Vrátí Boolean hodnotu, která označuje, zda byl převod úspěšný nebo neúspěšný.

Viz také

• Analýza řetězců data a času v .NET

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::UInt64 value);

[System.CLSCompliant(false)]
public static DateTime ToDateTime (ulong value);

[<System.CLSCompliant(false)>]
static member ToDateTime : uint64 -> DateTime

Public Shared Function ToDateTime (value As ULong) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Atributy

CLSCompliantAttribute

Výjimky

Viz také

• UInt64

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::Object ^ value, IFormatProvider ^ provider);

public static DateTime ToDateTime (object value, IFormatProvider provider);

public static DateTime ToDateTime (object? value, IFormatProvider? provider);

static member ToDateTime : obj * IFormatProvider -> DateTime

Public Shared Function ToDateTime (value As Object, provider As IFormatProvider) As DateTime

Parametry

Návraty

Ekvivalent data a času hodnoty value, nebo ekvivalent data a času DateTime.MinValue , pokud value je null.

Výjimky

Příklady

Následující příklad definuje zprostředkovatele vlastního formátu , CustomProviderjehož GetFormat metoda vypíše zprávu do konzoly, že byla vyvolána, a pak vrátí DateTimeFormatInfo objekt jazykové verze, jejíž název byl předán jako parametr konstruktoru třídy. Každý z těchto CustomProvider objektů se používá k převodu prvků v poli objektů na hodnoty data a času. Výstup označuje, že CustomProvider objekt se používá při převodu pouze v případech, kdy je typem parametru valueString.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] cultureNames = { "en-US", "hu-HU", "pt-PT" };
      object[] objects = { 12, 17.2, false, new DateTime(2010, 1, 1), "today",
                           new System.Collections.ArrayList(), 'c',
                           "05/10/2009 6:13:18 PM", "September 8, 1899" };

      foreach (string cultureName in cultureNames)
      {
         Console.WriteLine("{0} culture:", cultureName);
         CustomProvider provider = new CustomProvider(cultureName);
         foreach (object obj in objects)
         {
            try {
               DateTime dateValue = Convert.ToDateTime(obj, provider);
               Console.WriteLine("{0} --> {1}", obj,
                                 dateValue.ToString(new CultureInfo(cultureName)));
            }
            catch (FormatException) {
               Console.WriteLine("{0} --> Bad Format", obj);
            }
            catch (InvalidCastException) {
               Console.WriteLine("{0} --> Conversion Not Supported", obj);
            }
         }
         Console.WriteLine();
      }
   }
}

public class CustomProvider : IFormatProvider
{
   private string cultureName;

   public CustomProvider(string cultureName)
   {
      this.cultureName = cultureName;
   }

   public object GetFormat(Type formatType)
   {
      if (formatType == typeof(DateTimeFormatInfo))
      {
         Console.Write("(CustomProvider retrieved.) ");
         return new CultureInfo(cultureName).GetFormat(formatType);
      }
      else
      {
         return null;
      }
   }
}
// The example displays the following output:
//    en-US culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 1/1/2010 12:00:00 AM
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 5/10/2009 6:13:18 PM
//    (CustomProvider retrieved.) September 8, 1899 --> 9/8/1899 12:00:00 AM
//
//    hu-HU culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 2010. 01. 01. 0:00:00
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 2009. 05. 10. 18:13:18
//    (CustomProvider retrieved.) September 8, 1899 --> 1899. 09. 08. 0:00:00
//
//    pt-PT culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 01-01-2010 0:00:00
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 05-10-2009 18:13:18
//    (CustomProvider retrieved.) September 8, 1899 --> 08-09-1899 0:00:00

open System
open System.Globalization

type CustomProvider(cultureName: string) =
    interface IFormatProvider with
        member _.GetFormat(formatType) =
            if formatType = typeof<DateTimeFormatInfo> then
                printf "(CustomProvider retrieved.) "
                CultureInfo(cultureName).GetFormat formatType
            else
                null

let cultureNames = [ "en-US"; "hu-HU"; "pt-PT" ]
let objects: obj list =
    [ 12; 17.2; false; DateTime(2010, 1, 1); "today"
      System.Collections.ArrayList(); 'c'
      "05/10/2009 6:13:18 PM"; "September 8, 1899" ]

for cultureName in cultureNames do
    printfn $"{cultureName} culture:"
    let provider = CustomProvider cultureName
    for obj in objects do
        try
            let dateValue = Convert.ToDateTime(obj, provider)
            printfn $"{obj} --> {dateValue.ToString(CultureInfo cultureName)}"
        with
        | :? FormatException ->
            printfn $"{obj} --> Bad Format"
        | :? InvalidCastException ->
            printfn $"{obj} --> Conversion Not Supported"
    printfn ""

// The example displays the following output:
//    en-US culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 1/1/2010 12:00:00 AM
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 5/10/2009 6:13:18 PM
//    (CustomProvider retrieved.) September 8, 1899 --> 9/8/1899 12:00:00 AM
//
//    hu-HU culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 2010. 01. 01. 0:00:00
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 2009. 05. 10. 18:13:18
//    (CustomProvider retrieved.) September 8, 1899 --> 1899. 09. 08. 0:00:00
//
//    pt-PT culture:
//    12 --> Conversion Not Supported
//    17.2 --> Conversion Not Supported
//    False --> Conversion Not Supported
//    1/1/2010 12:00:00 AM --> 01-01-2010 0:00:00
//    (CustomProvider retrieved.) today --> Bad Format
//    System.Collections.ArrayList --> Conversion Not Supported
//    c --> Conversion Not Supported
//    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 05-10-2009 18:13:18
//    (CustomProvider retrieved.) September 8, 1899 --> 08-09-1899 0:00:00

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim cultureNames() As String = { "en-US", "hu-HU", "pt-PT" }
      Dim objects() As Object = { 12, 17.2, False, #1/1/2010#, "today", _
                                  New System.Collections.ArrayList(), "c"c, _
                                  "05/10/2009 6:13:18 PM", "September 8, 1899" }
      
      For Each cultureName As String In cultureNames
         Console.WriteLine("{0} culture:", cultureName)
         Dim provider As New CustomProvider(cultureName)
         For Each obj As Object In objects
            Try
               Dim dateValue As Date = Convert.ToDateTime(obj, provider)      
               Console.WriteLine("{0} --> {1}", obj, _
                                 dateValue.ToString(New CultureInfo(cultureName)))
            Catch e As FormatException
               Console.WriteLine("{0} --> Bad Format", obj)
            Catch e As InvalidCastException
               Console.WriteLine("{0} --> Conversion Not Supported", obj)
            End Try
         Next
         Console.WriteLine()
      Next
   End Sub
End Module

Public Class CustomProvider : Implements IFormatProvider
   Private cultureName As String
   
   Public Sub New(cultureName As String)
      Me.cultureName = cultureName
   End Sub
   
   Public Function GetFormat(formatType As Type) As Object _
          Implements IFormatProvider.GetFormat
      If formatType Is GetType(DateTimeFormatInfo) Then
         Console.Write("(CustomProvider retrieved.) ")
         Return New CultureInfo(cultureName).GetFormat(formatType)
      Else
         Return Nothing
      End If   
   End Function
End Class
' The example displays the following output:
'    en-US culture:
'    12 --> Conversion Not Supported
'    17.2 --> Conversion Not Supported
'    False --> Conversion Not Supported
'    1/1/2010 12:00:00 AM --> 1/1/2010 12:00:00 AM
'    (CustomProvider retrieved.) today --> Bad Format
'    System.Collections.ArrayList --> Conversion Not Supported
'    c --> Conversion Not Supported
'    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 5/10/2009 6:13:18 PM
'    (CustomProvider retrieved.) September 8, 1899 --> 9/8/1899 12:00:00 AM
'    
'    hu-HU culture:
'    12 --> Conversion Not Supported
'    17.2 --> Conversion Not Supported
'    False --> Conversion Not Supported
'    1/1/2010 12:00:00 AM --> 2010. 01. 01. 0:00:00
'    (CustomProvider retrieved.) today --> Bad Format
'    System.Collections.ArrayList --> Conversion Not Supported
'    c --> Conversion Not Supported
'    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 2009. 05. 10. 18:13:18
'    (CustomProvider retrieved.) September 8, 1899 --> 1899. 09. 08. 0:00:00
'    
'    pt-PT culture:
'    12 --> Conversion Not Supported
'    17.2 --> Conversion Not Supported
'    False --> Conversion Not Supported
'    1/1/2010 12:00:00 AM --> 01-01-2010 0:00:00
'    (CustomProvider retrieved.) today --> Bad Format
'    System.Collections.ArrayList --> Conversion Not Supported
'    c --> Conversion Not Supported
'    (CustomProvider retrieved.) 05/10/2009 6:13:18 PM --> 05-10-2009 18:13:18
'    (CustomProvider retrieved.) September 8, 1899 --> 08-09-1899 0:00:00

Poznámky

Návratová hodnota je výsledkem vyvolání IConvertible.ToDateTime metody základního valuetypu .

provider umožňuje uživateli zadat informace o převodu specifické pro jazykovou verzi obsahu nástroje value. Pokud value například představuje String datum, provider může poskytnout informace specifické pro jazykovou verzi o zápisu použitém k reprezentaci daného data. providerje zapojen do převodu, value pokud je Stringtyp value modulu runtime , nebo pokud value je uživatelem definovaný typ, jehož IConvertible.ToDateTime implementace využívá provider. Pokud typ modulu runtime value je String a provider je null, použije se CultureInfo objekt, který představuje aktuální jazykovou verzi.

Viz také

• Analýza řetězců data a času v .NET

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::SByte value);

[System.CLSCompliant(false)]
public static DateTime ToDateTime (sbyte value);

[<System.CLSCompliant(false)>]
static member ToDateTime : sbyte -> DateTime

Public Shared Function ToDateTime (value As SByte) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Atributy

CLSCompliantAttribute

Výjimky

Viz také

• Byte

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::UInt32 value);

[System.CLSCompliant(false)]
public static DateTime ToDateTime (uint value);

[<System.CLSCompliant(false)>]
static member ToDateTime : uint32 -> DateTime

Public Shared Function ToDateTime (value As UInteger) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Atributy

CLSCompliantAttribute

Výjimky

Viz také

• UInt32

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::Object ^ value);

public static DateTime ToDateTime (object value);

public static DateTime ToDateTime (object? value);

static member ToDateTime : obj -> DateTime

Public Shared Function ToDateTime (value As Object) As DateTime

Parametry

Návraty

Ekvivalent data a času hodnoty value, nebo ekvivalent data a času DateTime.MinValue , pokud value je null.

Výjimky

Příklady

Následující příklad volá metodu ToDateTime(Object) s různými proměnnými Object .

using System;

public class ConversionToDateTime
{
   public static void Main()
   {
      // Try converting an integer.
      int number = 16352;
      ConvertToDateTime(number);

      // Convert a null.
      object obj = null;
      ConvertToDateTime(obj);

      // Convert a non-date string.
      string nonDateString = "monthly";
      ConvertToDateTime(nonDateString);

      // Try to convert various date strings.
      string dateString;
      dateString = "05/01/1996";
      ConvertToDateTime(dateString);
      dateString = "Tue Apr 28, 2009";
      ConvertToDateTime(dateString);
      dateString = "06 July 2008 7:32:47 AM";
      ConvertToDateTime(dateString);
      dateString = "17:32:47.003";
      ConvertToDateTime(dateString);
   }

   private static void ConvertToDateTime(object value)
   {
      DateTime convertedDate;
      try {
         convertedDate = Convert.ToDateTime(value);
         Console.WriteLine("'{0}' converts to {1}.", value, convertedDate);
      }
      catch (FormatException) {
         Console.WriteLine("'{0}' is not in the proper format.", value);
      }
      catch (InvalidCastException) {
         Console.WriteLine("Conversion of the {0} '{1}' is not supported",
                           value.GetType().Name, value);
      }
   }
}
// The example displays the following output:
//       Conversion of the Int32 '16352' is not supported
//       '' converts to 1/1/0001 12:00:00 AM.
//       'monthly' is not in the proper format.
//       '05/01/1996' converts to 5/1/1996 12:00:00 AM.
//       'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM.
//       '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM.
//       '17:32:47.003' converts to 5/28/2008 5:32:47 PM.

open System

let convertToDateTime (value: obj) =
    try
        let convertedDate = Convert.ToDateTime value
        printfn $"'{value}' converts to {convertedDate}."
    with
    | :? FormatException ->
        printfn $"'{value}' is not in the proper format."
    | :? InvalidCastException ->
        printfn $"Conversion of the {value.GetType().Name} '{value}' is not supported"

[<EntryPoint>]
let main _ =
    // Try converting an integer.
    let number = 16352
    convertToDateTime number

    // Convert a null.
    let obj = box null
    convertToDateTime obj

    // Convert a non-date string.
    let nonDateString = "monthly"
    convertToDateTime nonDateString

    // Try to convert various date strings.
    let dateString = "05/01/1996"
    convertToDateTime dateString
    let dateString = "Tue Apr 28, 2009"
    convertToDateTime dateString
    let dateString = "06 July 2008 7:32:47 AM"
    convertToDateTime dateString
    let dateString = "17:32:47.003"
    convertToDateTime dateString

    0

// The example displays the following output:
//       Conversion of the Int32 '16352' is not supported
//       '' converts to 1/1/0001 12:00:00 AM.
//       'monthly' is not in the proper format.
//       '05/01/1996' converts to 5/1/1996 12:00:00 AM.
//       'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM.
//       '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM.
//       '17:32:47.003' converts to 5/28/2008 5:32:47 PM.

Module ConversionToDateTime
   Public Sub Main()
      ' Try converting an integer.
      Dim number As Integer = 16352
      ConvertToDateTime(number)
      
      ' Convert a null.
      Dim obj As Object = Nothing
      ConvertToDateTime(obj)
      
      ' Convert a non-date string.
      Dim nonDateString As String = "monthly"
      ConvertToDateTime(nonDateString)
      
      ' Try to convert various dates.
      Dim dateString As String 
      dateString = "05/01/1996"
      ConvertToDateTime(dateString)
      dateString = "Tue Apr 28, 2009"
      ConvertToDateTime(dateString)
      dateString = "06 July 2008 7:32:47 AM"
      ConvertToDateTime(dateString)
      dateString = "17:32:47.003"
      ConvertToDateTime(dateString)
   End Sub
   
   Private Sub ConvertToDateTime(value As Object)
      Dim convertedDate As Date
      Try
         convertedDate = Convert.ToDateTime(value)
         Console.WriteLine("'{0}' converts to {1}.", value, convertedDate)
      Catch e As FormatException
         Console.WriteLine("'{0}' is not in the proper format.", value)
      Catch e As InvalidCastException
         Console.WriteLine("Conversion of the {0} '{1}' is not supported", _
                           value.GetType().Name, value)
      End Try
   End Sub
End Module
' The example displays the following output:
'       Conversion of the Int32 '16352' is not supported
'       '' converts to 1/1/0001 12:00:00 AM.
'       'monthly' is not in the proper format.
'       '05/01/1996' converts to 5/1/1996 12:00:00 AM.
'       'Tue Apr 28, 2009' converts to 4/28/2009 12:00:00 AM.
'       '06 July 2008 7:32:47 AM' converts to 7/6/2008 7:32:47 AM.
'       '17:32:47.003' converts to 5/28/2008 5:32:47 PM.

Poznámky

Aby byl převod úspěšný, musí být typem value modulu runtime parametru DateTimeStringnebo , nebo value musí být null. V opačném případě metoda vyvolá .InvalidCastException Pokud je navíc value řetězec, musí obsahovat platnou reprezentaci hodnoty data a času v aktuální jazykové verzi nebo FormatException je vyvolán.

Návratová hodnota je výsledkem vyvolání IConvertible.ToDateTime metody základního valuetypu .

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(short value);

public static DateTime ToDateTime (short value);

static member ToDateTime : int16 -> DateTime

Public Shared Function ToDateTime (value As Short) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Int16

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(int value);

public static DateTime ToDateTime (int value);

static member ToDateTime : int -> DateTime

Public Shared Function ToDateTime (value As Integer) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Int32

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(long value);

public static DateTime ToDateTime (long value);

static member ToDateTime : int64 -> DateTime

Public Shared Function ToDateTime (value As Long) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Int64

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(double value);

public static DateTime ToDateTime (double value);

static member ToDateTime : double -> DateTime

Public Shared Function ToDateTime (value As Double) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Double

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::Decimal value);

public static DateTime ToDateTime (decimal value);

static member ToDateTime : decimal -> DateTime

Public Shared Function ToDateTime (value As Decimal) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(DateTime value);

public static DateTime ToDateTime (DateTime value);

static member ToDateTime : DateTime -> DateTime

Public Shared Function ToDateTime (value As DateTime) As DateTime

Parametry

Návraty

value se vrátí beze změny.

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(char value);

public static DateTime ToDateTime (char value);

static member ToDateTime : char -> DateTime

Public Shared Function ToDateTime (value As Char) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Char

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(System::Byte value);

public static DateTime ToDateTime (byte value);

static member ToDateTime : byte -> DateTime

Public Shared Function ToDateTime (value As Byte) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Byte

Zdroj:

Convert.cs

Zdroj:

Convert.cs

Zdroj:

Convert.cs

public:
 static DateTime ToDateTime(bool value);

public static DateTime ToDateTime (bool value);

static member ToDateTime : bool -> DateTime

Public Shared Function ToDateTime (value As Boolean) As DateTime

Parametry

Návraty

Tento převod není podporován. Není vrácena žádná hodnota.

Výjimky

Viz také

• Boolean