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TimeSpan.FromHours Method

Returns a TimeSpan that represents a specified number of hours, where the specification is accurate to the nearest millisecond.

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

public static TimeSpan FromHours(
	double value


Type: System.Double
A number of hours, accurate to the nearest millisecond.

Return Value

Type: System.TimeSpan
An object that represents value.


value is less than MinValue or greater than MaxValue.


value is Double.PositiveInfinity.


value is Double.NegativeInfinity.


value is equal to Double.NaN.

The value parameter is converted to milliseconds, which is converted to ticks, and that number of ticks is used to initialize the new TimeSpan. Therefore, value will only be considered accurate to the nearest millisecond. Note that, because of the loss of precision of the Double data type, this conversion can generate an OverflowException for values that are near to but still in the range of either MinValue or MaxValue. For example, this causes an OverflowException in the following attempt to instantiate a TimeSpan object.

// The following throws an OverflowException at runtime
TimeSpan maxSpan = TimeSpan.FromHours(TimeSpan.MaxValue.TotalHours);

The following code example creates several TimeSpan objects using the FromHours method.

// Example of the TimeSpan.FromHours( double ) method.
using System;

class Example
   static void GenTimeSpanFromHours(System.Windows.Controls.TextBlock outputBlock, double hours)
      // Create a TimeSpan object and TimeSpan string from 
      // a number of hours.
      TimeSpan interval = TimeSpan.FromHours(hours);
      string timeInterval = interval.ToString();

      // Pad the end of the TimeSpan string with spaces if it 
      // does not contain milliseconds.
      int pIndex = timeInterval.IndexOf(':');
      pIndex = timeInterval.IndexOf('.', pIndex);
      if (pIndex < 0) timeInterval += "        ";

      outputBlock.Text += String.Format("{0,21}{1,26}", hours, timeInterval) + "\n";

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      outputBlock.Text += 
          "This example of TimeSpan.FromHours( double )\n" +
          "generates the following output.\n" + "\n";
      outputBlock.Text += "{0,21}{1,18}",
          "FromHours", "TimeSpan" + "\n";
      outputBlock.Text += "{0,21}{1,18}",
          "---------", "--------" + "\n";

      GenTimeSpanFromHours(outputBlock, 0.0000002);
      GenTimeSpanFromHours(outputBlock, 0.0000003);
      GenTimeSpanFromHours(outputBlock, 0.0012345);
      GenTimeSpanFromHours(outputBlock, 12.3456789);
      GenTimeSpanFromHours(outputBlock, 123456.7898765);
      GenTimeSpanFromHours(outputBlock, 0.0002777);
      GenTimeSpanFromHours(outputBlock, 0.0166666);
      GenTimeSpanFromHours(outputBlock, 1);
      GenTimeSpanFromHours(outputBlock, 24);
      GenTimeSpanFromHours(outputBlock, 500.3389445);

This example of TimeSpan.FromHours( double )
generates the following output.

            FromHours          TimeSpan
            ---------          --------
                2E-07          00:00:00.0010000
                3E-07          00:00:00.0010000
            0.0012345          00:00:04.4440000
           12.3456789          12:20:44.4440000
       123456.7898765     5144.00:47:23.5550000
            0.0002777          00:00:01
            0.0166666          00:01:00
                    1          01:00:00
                   24        1.00:00:00
          500.3389445       20.20:20:20.2000000


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

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

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