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ToString Method (String, IFormatProvider)

DateTime.ToString Method (String, IFormatProvider)

Converts the value of the current DateTime object to its equivalent string representation using the specified format and culture-specific format information.

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

abstract ToString : 
        format:string * 
        provider:IFormatProvider -> string  
override ToString : 
        format:string * 
        provider:IFormatProvider -> string


Type: System.String

A standard or custom date and time format string.

Type: System.IFormatProvider

An object that supplies culture-specific formatting information.

Return Value

Type: System.String
A string representation of value of the current DateTime object as specified by format and provider.


IFormattable.ToString(String, IFormatProvider)


The length of format is 1, and it is not one of the format specifier characters defined for DateTimeFormatInfo.


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.

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 a null reference (Nothing in Visual Basic) 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:

If provider is a null reference (Nothing in Visual Basic), 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 Calendar.MinSupportedDateTime or later than Calendar.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.

No code example is currently available or this language may not be supported.

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.

No code example is currently available or this language may not be supported.

The following example demonstrates different ways of formatting a DateTime value using the invariant DateTimeFormatInfo.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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