DateTime.TryParse Method (String, DateTime) (System)

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TryParse Method (String, DateTime)

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

DateTime..::.TryParse Method (String, DateTime%)

Updated: July 2008

Converts the specified string representation of a date and time to its DateTime equivalent and returns a value that indicates whether the conversion succeeded.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

Visual Basic (Declaration)

Public Shared Function TryParse ( _
    s As String, _
    <OutAttribute> ByRef result As DateTime _
) As Boolean

Visual Basic (Usage)

Dim s As String
Dim result As DateTime
Dim returnValue As Boolean

returnValue = DateTime.TryParse(s, result)

public static bool TryParse(
    string s,
    out DateTime result
)

Visual C++

public:
static bool TryParse(
    String^ s, 
    [OutAttribute] DateTime% result
)

JScript

public static function TryParse(
    s : String, 
    result : DateTime
) : boolean

Parameters

s: Type: System..::.String
A string containing a date and time to convert.

result: Type: System..::.DateTime%
When this method returns, contains the DateTime value equivalent to the date and time contained in s, if the conversion succeeded, or DateTime..::.MinValue if the conversion failed. The conversion fails if the s parameter is nullNothingnullptra null reference (Nothing in Visual Basic), is an empty string (""), or does not contain a valid string representation of a date and time. This parameter is passed uninitialized.

Return Value

Type: System..::.Boolean
true if the s parameter was converted successfully; otherwise, false.

Remarks

The DateTime..::.TryParse(String, DateTime%) method is similar to the DateTime..::.Parse(String) method, except that the TryParse(String, DateTime%) method does not throw an exception if the conversion fails.

The string s is parsed using formatting information in the current DateTimeFormatInfo object, which is supplied implicitly by the current thread culture. The s parameter must contain the representation of a date and time in one of the formats returned by the DateTimeFormatInfo..::.GetAllDateTimePatterns()()() method of the current culture.

This method tries to ignore unrecognized data, if possible, and fills in missing month, day, and year information with the current date. If s contains only a date and no time, this method assumes the time is 12:00 midnight. Any leading, inner, or trailing white space character in s is ignored. The date and time can be bracketed with a pair of leading and trailing NUMBER SIGN characters ('#', U+0023), and can be trailed with one or more NULL characters (U+0000).

Because the DateTime..::.TryParse(String, DateTime%) method tries to parse the string representation of a date and time using the formatting rules of the current culture, trying to parse a particular string across different cultures can either fail or return different results. If a specific date and time format will be parsed across different locales, use the DateTime..::.TryParse(String, IFormatProvider, DateTimeStyles, DateTime%) method or one of the overloads of the TryParseExact method and provide a format specifier.

If s contains no time zone information, result contains a DateTime value whose Kind property is DateTimeKind..::.Unspecified when the method returns. If the string to be parsed contains time zone information, result contains a DateTime value whose Kind property is DateTimeKind..::.Local when the method returns.

Notes to Callers:

Formatting is influenced by properties of the current DateTimeFormatInfo object, which by default are derived from the Regional and Language Options item in Control Panel. The TryParse method can unexpectedly fail and return False if the current DateTimeFormatInfo..::.DateSeparator and DateTimeFormatInfo..::.TimeSeparator properties are set to the same value.

Examples

The following example passes a number of date and time strings to the DateTime..::.TryParse(String, DateTime%) method.

Visual Basic

Dim dateStrings() As String = {"05/01/2009 14:57:32.8", "2009-05-01 14:57:32.8", _
                               "2009-05-01T14:57:32.8375298-04:00", _
                               "5/01/2008 14:57:32.80 -07:00", _
                               "1 May 2008 2:57:32.8 PM", "16-05-2009 1:00:32 PM", _
                               "Fri, 15 May 2009 20:10:57 GMT"}
Dim dateValue As Date

Console.WriteLine("Attempting to parse strings using {0} culture.", _
                  CultureInfo.CurrentCulture.Name)
For Each dateString As String In dateStrings
   If Date.TryParse(dateString, dateValue) Then
      Console.WriteLine("  Converted '{0}' to {1} ({2}).", dateString, _
                        dateValue, dateValue.Kind)
   Else
      Console.WriteLine("  Unable to parse '{0}'.", dateString)
   End If
Next
' The example displays the following output:
'    Attempting to parse strings using en-US culture.
'       Converted '05/01/2009 14:57:32.8' to 5/1/2009 2:57:32 PM (Unspecified).
'       Converted '2009-05-01 14:57:32.8' to 5/1/2009 2:57:32 PM (Unspecified).
'       Converted '2009-05-01T14:57:32.8375298-04:00' to 5/1/2009 11:57:32 AM (Local).
'       Converted '5/01/2008 14:57:32.80 -07:00' to 5/1/2008 2:57:32 PM (Local).
'       Converted '1 May 2008 2:57:32.8 PM' to 5/1/2008 2:57:32 PM (Unspecified).
'       Unable to parse '16-05-2009 1:00:32 PM'.
'       Converted 'Fri, 15 May 2009 20:10:57 GMT' to 5/15/2009 1:10:57 PM (Local).

string[] dateStrings = {"05/01/2009 14:57:32.8", "2009-05-01 14:57:32.8", 
                        "2009-05-01T14:57:32.8375298-04:00", 
                        "5/01/2008 14:57:32.80 -07:00", 
                        "1 May 2008 2:57:32.8 PM", "16-05-2009 1:00:32 PM", 
                        "Fri, 15 May 2009 20:10:57 GMT" };
DateTime dateValue;

Console.WriteLine("Attempting to parse strings using {0} culture.", 
                  CultureInfo.CurrentCulture.Name);
foreach (string dateString in dateStrings)
{
   if (DateTime.TryParse(dateString, out dateValue)) 
      Console.WriteLine("  Converted '{0}' to {1} ({2}).", dateString, 
                        dateValue, dateValue.Kind);
   else
      Console.WriteLine("  Unable to parse '{0}'.", dateString);
}
// The example displays the following output:
//    Attempting to parse strings using en-US culture.
//       Converted '05/01/2009 14:57:32.8' to 5/1/2009 2:57:32 PM (Unspecified).
//       Converted '2009-05-01 14:57:32.8' to 5/1/2009 2:57:32 PM (Unspecified).
//       Converted '2009-05-01T14:57:32.8375298-04:00' to 5/1/2009 11:57:32 AM (Local).
//       Converted '5/01/2008 14:57:32.80 -07:00' to 5/1/2008 2:57:32 PM (Local).
//       Converted '1 May 2008 2:57:32.8 PM' to 5/1/2008 2:57:32 PM (Unspecified).
//       Unable to parse '16-05-2009 1:00:32 PM'.
//       Converted 'Fri, 15 May 2009 20:10:57 GMT' to 5/15/2009 1:10:57 PM (Local).

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information