DateTimeOffset.TryParse Method (System) (original) (raw)

Source:

Tries to convert a specified string representation of a date and time to its DateTimeOffset equivalent, and returns a value that indicates whether the conversion succeeded.

public:
 static bool TryParse(System::String ^ input, IFormatProvider ^ formatProvider, System::Globalization::DateTimeStyles styles, [Runtime::InteropServices::Out] DateTimeOffset % result);

public static bool TryParse(string input, IFormatProvider formatProvider, System.Globalization.DateTimeStyles styles, out DateTimeOffset result);

public static bool TryParse(string? input, IFormatProvider? formatProvider, System.Globalization.DateTimeStyles styles, out DateTimeOffset result);

static member TryParse : string * IFormatProvider * System.Globalization.DateTimeStyles * DateTimeOffset -> bool

Public Shared Function TryParse (input As String, formatProvider As IFormatProvider, styles As DateTimeStyles, ByRef result As DateTimeOffset) As Boolean

Parameters

input

String

A string that contains a date and time to convert.

formatProvider

IFormatProvider

An object that provides culture-specific formatting information about input.

styles

DateTimeStyles

A bitwise combination of enumeration values that indicates the permitted format of input.

result

DateTimeOffset

When the method returns, contains the DateTimeOffset value equivalent to the date and time of input, if the conversion succeeded, or DateTimeOffset.MinValue, if the conversion failed. The conversion fails if the input parameter is null or does not contain a valid string representation of a date and time. This parameter is passed uninitialized.

Returns

true if the input parameter is successfully converted; otherwise, false.

Exceptions

Examples

The following example calls the TryParse(String, IFormatProvider, DateTimeStyles, DateTimeOffset) method with a variety of DateTimeStyles values to parse some strings with various date and time formats.

string dateString;
DateTimeOffset parsedDate;

dateString = "05/01/2008 6:00:00";
// Assume time is local
if (DateTimeOffset.TryParse(dateString, null as IFormatProvider,
                            DateTimeStyles.AssumeLocal,
                            out parsedDate))
   Console.WriteLine("'{0}' was converted to {1}.",
                     dateString, parsedDate.ToString());
else
   Console.WriteLine("Unable to parse '{0}'.", dateString);

// Assume time is UTC
if (DateTimeOffset.TryParse(dateString, null as IFormatProvider,
                            DateTimeStyles.AssumeUniversal,
                            out parsedDate))
   Console.WriteLine("'{0}' was converted to {1}.",
                     dateString, parsedDate.ToString());
else
   Console.WriteLine("Unable to parse '{0}'.", dateString);

// Parse and convert to UTC
dateString = "05/01/2008 6:00:00AM +5:00";
if (DateTimeOffset.TryParse(dateString, null as IFormatProvider,
                           DateTimeStyles.AdjustToUniversal,
                           out parsedDate))
   Console.WriteLine("'{0}' was converted to {1}.",
                     dateString, parsedDate.ToString());
else
   Console.WriteLine("Unable to parse '{0}'.", dateString);
// The example displays the following output to the console:
//    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM -07:00.
//    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM +00:00.
//    '05/01/2008 6:00:00AM +5:00' was converted to 5/1/2008 1:00:00 AM +00:00.

let dateString = "05/01/2008 6:00:00"
// Assume time is local
match DateTimeOffset.TryParse(dateString, null, DateTimeStyles.AssumeLocal) with
| true, parsedDate ->
    printfn $"'{dateString}' was converted to {parsedDate}."
| _ ->
    printfn $"Unable to parse '{dateString}'."

// Assume time is UTC
match DateTimeOffset.TryParse(dateString, null, DateTimeStyles.AssumeUniversal) with
| true, parsedDate ->
    printfn $"'{dateString}' was converted to {parsedDate}."
| _ ->
    printfn $"Unable to parse '{dateString}'."

// Parse and convert to UTC
let dateString = "05/01/2008 6:00:00AM +5:00"
match DateTimeOffset.TryParse(dateString, null, DateTimeStyles.AdjustToUniversal) with
| true, parsedDate ->
    printfn $"'{dateString}' was converted to {parsedDate}."
| _ ->
    printfn $"Unable to parse '{dateString}'."

// The example displays the following output to the console:
//    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM -07:00.
//    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM +00:00.
//    '05/01/2008 6:00:00AM +5:00' was converted to 5/1/2008 1:00:00 AM +00:00.

Dim dateString As String
Dim parsedDate As DateTimeOffset

dateString = "05/01/2008 6:00:00"
' Assume time is local 
If DateTimeOffset.TryParse(dateString, Nothing, _
                           DateTimeStyles.AssumeLocal, _
                           parsedDate) Then
   Console.WriteLine("'{0}' was converted to {1}.", _
                     dateString, parsedDate.ToString())
Else
   Console.WriteLine("Unable to parse '{0}'.", dateString)    
End If

' Assume time is UTC
If DateTimeOffset.TryParse(dateString, Nothing, _
                           DateTimeStyles.AssumeUniversal, _
                           parsedDate) Then
   Console.WriteLine("'{0}' was converted to {1}.", _
                     dateString, parsedDate.ToString())
Else
   Console.WriteLine("Unable to parse '{0}'.", dateString)    
End If

' Parse and convert to UTC 
dateString = "05/01/2008 6:00:00AM +5:00"
If DateTimeOffset.TryParse(dateString, Nothing, _
                           DateTimeStyles.AdjustToUniversal, _
                           parsedDate) Then
   Console.WriteLine("'{0}' was converted to {1}.", _
                     dateString, parsedDate.ToString())
Else
   Console.WriteLine("Unable to parse '{0}'.", dateString)    
End If
' The example displays the following output to the console:
'    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM -07:00.
'    '05/01/2008 6:00:00' was converted to 5/1/2008 6:00:00 AM +00:00.
'    '05/01/2008 6:00:00AM +5:00' was converted to 5/1/2008 1:00:00 AM +00:00.

Remarks

This overload of the TryParse(String, IFormatProvider, DateTimeStyles, DateTimeOffset) method is like the DateTimeOffset.Parse(String, IFormatProvider, DateTimeStyles) method, except that it does not throw an exception if the conversion fails. The method parses a string with three elements that can appear in any order and are delimited by white space. These three elements are shown in the following table.

Element	Example
	"2/10/2007"
	"1:02:03 PM"
	"-7:30"

Although each of these elements is optional, cannot appear by itself. It must be provided together with either or . If is missing, its default value is the current day. If is present but its year component consists of only two digits, it is converted to a year in the provider parameter's current calendar based on the value of the Calendar.TwoDigitYearMax property. If is missing, its default value is 12:00:00 AM. If is missing, its default value is the offset of the local time zone, or Zero if either the DateTimeStyles.AdjustToUniversal or DateTimeStyles.AssumeUniversal value is specified in styles. If is present, it can represent either a negative or a positive offset from Coordinated Universal Time (UTC). In either case, must include a sign symbol or the method returns false.

The input string is parsed by using the culture-specific formatting information in a DateTimeFormatInfo object supplied by the formatProvider parameter. The formatProvider parameter can be either of the following:

A CultureInfo object that represents the culture whose formatting is used in input. The DateTimeFormatInfo object returned by the CultureInfo.DateTimeFormat property defines the format that is used in input.
A DateTimeFormatInfo object that defines the format of date and time data.

In addition, each element can be delimited by leading or trailing white space, and the and components can include inner white space (such as 6: 00:00). Only the component cannot include inner white space.

If provider is null, the CultureInfo object that corresponds to the current culture is used.

The positive or negative sign used in must be either + or -. It is not defined by the PositiveSign or NegativeSign properties of the NumberFormatInfo object returned by the formatprovider parameter's NumberFormat property.

The following members of the DateTimeStyles enumeration are supported:

DateTimeStyles Member	Comments
AdjustToUniversal	Parses the string represented by input and, if necessary, converts it to UTC. It is equivalent to parsing a string, and then calling the returned object's ToUniversalTime() method.
AllowInnerWhite	Although valid, this value is ignored. Inner white space is allowed in the and components.
AllowLeadingWhite	Although valid, this value is ignored. Leading white space is allowed in front of each component in the parsed string.
AllowTrailingWhite	Although valid, this value is ignored. Trailing white space is allowed in front of each component in the parsed string.
AllowWhiteSpaces	This is the default behavior. It cannot be overridden by supplying a more restrictive DateTimeStyles enumeration value, such as DateTimeStyles.None.
AssumeLocal	Indicates that, if the input parameter lacks an element, the offset of the local time zone should be provided. This is the default behavior of the TryParse(String, IFormatProvider, DateTimeStyles, DateTimeOffset) method.
AssumeUniversal	Indicates that, if the input parameter lacks an element, the UTC offset (00:00) should be provided.
None	Although valid, this value is ignored and has no effect.
RoundtripKind	Because the DateTimeOffset structure does not include a Kind property, this value has no effect.

Only the DateTimeStyles.NoCurrentDateDefault value is not supported. An ArgumentException is thrown if this value is included in the styles parameter.