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TimeSpan.Subtract Method

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Updated: October 2010

Returns a new TimeSpan object whose value is the difference between the specified TimeSpan object and this instance.

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

Syntax

'Declaration
Public Function Subtract ( _
    ts As TimeSpan _
) As TimeSpan

public TimeSpan Subtract(
    TimeSpan ts
)

Parameters

Return Value

Type: System.TimeSpan
A new time interval whose value is the result of the value of this instance minus the value of ts.

Exceptions

Exception Condition
OverflowException

The return value is less than MinValue or greater than MaxValue.

Remarks

The return value must be between MinValue and MaxValue; otherwise, an exception is thrown.

The return value is a new TimeSpan; the original TimeSpan is not modified.

Examples

The following code example creates several pairs of TimeSpan objects and calculates their difference with the Subtract method.

' Example of the TimeSpan.Add( ) and TimeSpan.Subtract( ) methods.

Module Example

   Const dataFmt As String = "{0,-24}{1,24}"

   ' Pad the end of a TimeSpan string with spaces if it does not 
   ' contain milliseconds.
   Function Align(ByVal interval As TimeSpan) As String

      Dim intervalStr As String = interval.ToString()
      Dim pointIndex As Integer = intervalStr.IndexOf(":"c)

      pointIndex = intervalStr.IndexOf("."c, pointIndex)
      If pointIndex < 0 Then intervalStr &= "        "
      Align = intervalStr
   End Function

   ' Display TimeSpan parameters and their sum and difference.
   Sub ShowTimeSpanSumDiff(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal Left As TimeSpan, ByVal Right As TimeSpan)

      outputBlock.Text &= vbCrLf
      outputBlock.Text &= String.Format(dataFmt, "TimeSpan Left", Align(Left)) & vbCrLf
      outputBlock.Text &= String.Format(dataFmt, "TimeSpan Right", Align(Right)) & vbCrLf
      outputBlock.Text &= String.Format(dataFmt, "Left.Add( Right ) & vbCrLf", _
          Align(Left.Add(Right)))
      outputBlock.Text &= String.Format(dataFmt, "Left.Subtract( Right ) & vbCrLf", _
          Align(Left.Subtract(Right)))
   End Sub

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.Text &= _
          "This example of the TimeSpan.Add( ) and " & _
          "TimeSpan.Subtract( ) " & vbCrLf & "methods " & _
          "generates the following output by creating several " & _
          vbCrLf & "pairs of TimeSpan objects and calculating " & _
          "and displaying " & vbCrLf & "the sum " & _
          "and difference of each." & vbCrLf

      ' Create pairs of TimeSpan objects.
      ShowTimeSpanSumDiff(outputBlock, _
          New TimeSpan(1, 20, 0), _
          New TimeSpan(0, 45, 10))
      ShowTimeSpanSumDiff(outputBlock,  _
          New TimeSpan(1, 10, 20, 30, 40), _
          New TimeSpan(-1, 2, 3, 4, 5))
      ShowTimeSpanSumDiff(outputBlock,  _
          New TimeSpan(182, 12, 30, 30, 505), _
          New TimeSpan(182, 11, 29, 29, 495))
      ShowTimeSpanSumDiff(outputBlock,  _
          New TimeSpan(888888888888888), _
          New TimeSpan(999999999999999))
   End Sub
End Module

' This example of the TimeSpan.Add( ) and TimeSpan.Subtract( )
' methods generates the following output by creating several
' pairs of TimeSpan objects and calculating and displaying
' the sum and difference of each.
' 
' TimeSpan Left                   01:20:00
' TimeSpan Right                  00:45:10
' Left.Add( Right )               02:05:10
' Left.Subtract( Right )          00:34:50
' 
' TimeSpan Left                 1.10:20:30.0400000
' TimeSpan Right                 -21:56:55.9950000
' Left.Add( Right )               12:23:34.0450000
' Left.Subtract( Right )        2.08:17:26.0350000
' 
' TimeSpan Left               182.12:30:30.5050000
' TimeSpan Right              182.11:29:29.4950000
' Left.Add( Right )           365.00:00:00
' Left.Subtract( Right )          01:01:01.0100000
' 
' TimeSpan Left              1028.19:21:28.8888888
' TimeSpan Right             1157.09:46:39.9999999
' Left.Add( Right )          2186.05:08:08.8888887
' Left.Subtract( Right )     -128.14:25:11.1111111

// Example of the TimeSpan.Add( ) and TimeSpan.Subtract( ) methods.
using System;

class Example
{
   const string dataFmt = "{0,-24}{1,24}";

   // Pad the end of a TimeSpan string with spaces if it does not 
   // contain milliseconds.
   static string Align(TimeSpan interval)
   {
      string intervalStr = interval.ToString();
      int pointIndex = intervalStr.IndexOf(':');

      pointIndex = intervalStr.IndexOf('.', pointIndex);
      if (pointIndex < 0) intervalStr += "        ";
      return intervalStr;
   }

   // Display TimeSpan parameters and their sum and difference.
   static void ShowTimeSpanSumDiff(System.Windows.Controls.TextBlock outputBlock, TimeSpan Left, TimeSpan Right)
   {
      outputBlock.Text += "\n";
      outputBlock.Text += String.Format(dataFmt, "TimeSpan Left", Align(Left)) + "\n";
      outputBlock.Text += String.Format(dataFmt, "TimeSpan Right", Align(Right)) + "\n";
      outputBlock.Text += String.Format(dataFmt, "Left.Add( Right )",
          Align(Left.Add(Right))) + "\n";
      outputBlock.Text += String.Format(dataFmt, "Left.Subtract( Right )",
          Align(Left.Subtract(Right))) + "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text +=
          "This example of the TimeSpan.Add( ) and " +
          "TimeSpan.Subtract( ) \nmethods generates the " +
          "following output by creating several \npairs of " +
          "TimeSpan objects and calculating and displaying \n" +
          "the sum and difference of each." + "\n";

      // Create pairs of TimeSpan objects.
      ShowTimeSpanSumDiff(outputBlock, 
          new TimeSpan(1, 20, 0),
          new TimeSpan(0, 45, 10));
      ShowTimeSpanSumDiff(outputBlock, 
          new TimeSpan(1, 10, 20, 30, 40),
          new TimeSpan(-1, 2, 3, 4, 5));
      ShowTimeSpanSumDiff(outputBlock, 
          new TimeSpan(182, 12, 30, 30, 505),
          new TimeSpan(182, 11, 29, 29, 495));
      ShowTimeSpanSumDiff(outputBlock, 
          new TimeSpan(888888888888888),
          new TimeSpan(999999999999999));
   }
}

/*
This example of the TimeSpan.Add( ) and TimeSpan.Subtract( )
methods generates the following output by creating several
pairs of TimeSpan objects and calculating and displaying
the sum and difference of each.

TimeSpan Left                   01:20:00
TimeSpan Right                  00:45:10
Left.Add( Right )               02:05:10
Left.Subtract( Right )          00:34:50

TimeSpan Left                 1.10:20:30.0400000
TimeSpan Right                 -21:56:55.9950000
Left.Add( Right )               12:23:34.0450000
Left.Subtract( Right )        2.08:17:26.0350000

TimeSpan Left               182.12:30:30.5050000
TimeSpan Right              182.11:29:29.4950000
Left.Add( Right )           365.00:00:00
Left.Subtract( Right )          01:01:01.0100000

TimeSpan Left              1028.19:21:28.8888888
TimeSpan Right             1157.09:46:39.9999999
Left.Add( Right )          2186.05:08:08.8888887
Left.Subtract( Right )     -128.14:25:11.1111111
*/

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Change History

Date

History

Reason

October 2010

Added clarification that this method returns a new TimeSpan object.

Customer feedback.