• Article

TimeSpan.Subtraction Operator

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Subtracts a specified TimeSpan from another specified TimeSpan.

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

Syntax

'Declaration
Public Shared Operator - ( _
    t1 As TimeSpan, _
    t2 As TimeSpan _
) As TimeSpan

public static TimeSpan operator -(
    TimeSpan t1,
    TimeSpan t2
)

Parameters

  • t1
    Type: System.TimeSpan
    The time interval to subtract from (the minuend).

Return Value

Type: System.TimeSpan
An object whose value is the result of the value of t1 minus the value of t2.

Exceptions

Exception Condition
OverflowException

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

Examples

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

' Example of the TimeSpan Addition and Subtraction operators.

Module Example

   Const dataFmt As String = "{0,-38}{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, _
          "TimeSpan.op_Addition( Left, Right )", _
          Align(TimeSpan.op_Addition(Left, Right))) & vbCrLf
      outputBlock.Text &= String.Format(dataFmt, _
          "TimeSpan.op_Subtraction( Left, Right )", _
          Align(TimeSpan.op_Subtraction(Left, Right))) & vbCrLf
   End Sub

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.Text &= _
          "This example of the TimeSpan Addition and " & _
          "Subtraction " & vbCrLf & "operators " & _
          "generates the following output by creating " & vbCrLf & _
          "several pairs of TimeSpan objects and calculating " & _
          "and " & vbCrLf & "displaying 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 Addition and Subtraction
' operators 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
' TimeSpan.op_Addition( Left, Right )           02:05:10
' TimeSpan.op_Subtraction( Left, Right )        00:34:50
' 
' TimeSpan Left                               1.10:20:30.0400000
' TimeSpan Right                               -21:56:55.9950000
' TimeSpan.op_Addition( Left, Right )           12:23:34.0450000
' TimeSpan.op_Subtraction( Left, Right )      2.08:17:26.0350000
' 
' TimeSpan Left                             182.12:30:30.5050000
' TimeSpan Right                            182.11:29:29.4950000
' TimeSpan.op_Addition( Left, Right )       365.00:00:00
' TimeSpan.op_Subtraction( Left, Right )        01:01:01.0100000
' 
' TimeSpan Left                            1028.19:21:28.8888888
' TimeSpan Right                           1157.09:46:39.9999999
' TimeSpan.op_Addition( Left, Right )      2186.05:08:08.8888887
' TimeSpan.op_Subtraction( Left, Right )   -128.14:25:11.1111111

// Example of the TimeSpan Addition and Subtraction operators.
using System;

class Example
{
   const string dataFmt = "{0,-18}{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 + Right",
          Align(Left + Right)) + "\n";
      outputBlock.Text += String.Format(dataFmt, "Left - Right",
          Align(Left - Right)) + "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text += "This example of the TimeSpan " +
          "Addition and Subtraction \noperators generates the " +
          "following output by creating \nseveral pairs of " +
          "TimeSpan objects and calculating and \ndisplaying " +
          "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 Addition and Subtraction
operators 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 + Right              02:05:10
Left - Right              00:34:50

TimeSpan Left           1.10:20:30.0400000
TimeSpan Right           -21:56:55.9950000
Left + Right              12:23:34.0450000
Left - Right            2.08:17:26.0350000

TimeSpan Left         182.12:30:30.5050000
TimeSpan Right        182.11:29:29.4950000
Left + Right          365.00:00:00
Left - Right              01:01:01.0100000

TimeSpan Left        1028.19:21:28.8888888
TimeSpan Right       1157.09:46:39.9999999
Left + Right         2186.05:08:08.8888887
Left - 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.