TimeSpan.FromDays(Double) TimeSpan.FromDays(Double) TimeSpan.FromDays(Double) TimeSpan.FromDays(Double) Method

Definition

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

public:
 static TimeSpan FromDays(double value);
public static TimeSpan FromDays (double value);
static member FromDays : double -> TimeSpan
Public Shared Function FromDays (value As Double) As TimeSpan

Parameters

value
Double Double Double Double

A number of days, accurate to the nearest millisecond.

Returns

An object that represents value.

Exceptions

Examples

The following example creates several TimeSpan objects using the FromDays method.

// Example of the TimeSpan::FromDays( double ) method.
using namespace System;
void GenTimeSpanFromDays( double days )
{
   
   // Create a TimeSpan object and TimeSpan string from 
   // a number of days.
   TimeSpan interval = TimeSpan::FromDays( days );
   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 = String::Concat( timeInterval, "        " );

   Console::WriteLine( "{0,21}{1,26}", days, timeInterval );
}

int main()
{
   Console::WriteLine( "This example of TimeSpan::FromDays( double )\n"
   "generates the following output.\n" );
   Console::WriteLine( "{0,21}{1,18}", "FromDays", "TimeSpan" );
   Console::WriteLine( "{0,21}{1,18}", "--------", "--------" );
   GenTimeSpanFromDays( 0.000000006 );
   GenTimeSpanFromDays( 0.000000017 );
   GenTimeSpanFromDays( 0.000123456 );
   GenTimeSpanFromDays( 1.234567898 );
   GenTimeSpanFromDays( 12345.678987654 );
   GenTimeSpanFromDays( 0.000011574 );
   GenTimeSpanFromDays( 0.000694444 );
   GenTimeSpanFromDays( 0.041666666 );
   GenTimeSpanFromDays( 1 );
   GenTimeSpanFromDays( 20.84745602 );
}

/*
This example of TimeSpan::FromDays( double )
generates the following output.

             FromDays          TimeSpan
             --------          --------
                6E-09          00:00:00.0010000
              1.7E-08          00:00:00.0010000
          0.000123456          00:00:10.6670000
          1.234567898        1.05:37:46.6660000
      12345.678987654    12345.16:17:44.5330000
           1.1574E-05          00:00:01
          0.000694444          00:01:00
          0.041666666          01:00:00
                    1        1.00:00:00
          20.84745602       20.20:20:20.2000000
*/
// Example of the TimeSpan.FromDays( double ) method.
using System;

class FromDaysDemo
{
    static void GenTimeSpanFromDays( double days )
    {
        // Create a TimeSpan object and TimeSpan string from 
        // a number of days.
        TimeSpan interval = TimeSpan.FromDays( days );
        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 += "        ";

        Console.WriteLine( "{0,21}{1,26}", days, timeInterval );
    } 

    static void Main( )
    {
        Console.WriteLine(
            "This example of TimeSpan.FromDays( double )\n" +
            "generates the following output.\n" );
        Console.WriteLine( "{0,21}{1,18}",
            "FromDays", "TimeSpan" );
        Console.WriteLine( "{0,21}{1,18}", 
            "--------", "--------" );

        GenTimeSpanFromDays( 0.000000006 );
        GenTimeSpanFromDays( 0.000000017 );
        GenTimeSpanFromDays( 0.000123456 );
        GenTimeSpanFromDays( 1.234567898 );
        GenTimeSpanFromDays( 12345.678987654 );
        GenTimeSpanFromDays( 0.000011574 );
        GenTimeSpanFromDays( 0.000694444 );
        GenTimeSpanFromDays( 0.041666666 );
        GenTimeSpanFromDays( 1 );
        GenTimeSpanFromDays( 20.84745602 );
    } 
} 

/*
This example of TimeSpan.FromDays( double )
generates the following output.

             FromDays          TimeSpan
             --------          --------
                6E-09          00:00:00.0010000
              1.7E-08          00:00:00.0010000
          0.000123456          00:00:10.6670000
          1.234567898        1.05:37:46.6660000
      12345.678987654    12345.16:17:44.5330000
           1.1574E-05          00:00:01
          0.000694444          00:01:00
          0.041666666          01:00:00
                    1        1.00:00:00
          20.84745602       20.20:20:20.2000000
*/ 
' Example of the TimeSpan.FromDays( Double ) method.
Module FromDaysDemo

    Sub GenTimeSpanFromDays( days As Double )

        ' Create a TimeSpan object and TimeSpan string from 
        ' a number of days.
        Dim interval As TimeSpan = _
            TimeSpan.FromDays( days )
        Dim timeInterval As String = interval.ToString( )

        ' Pad the end of the TimeSpan string with spaces if it 
        ' does not contain milliseconds.
        Dim pIndex As Integer = timeInterval.IndexOf( ":"c )
        pIndex = timeInterval.IndexOf( "."c, pIndex )
        If pIndex < 0 Then  timeInterval &= "        "

        Console.WriteLine( "{0,21}{1,26}", days, timeInterval )
    End Sub 

    Sub Main( )

        Console.WriteLine( "This example of " & _
            "TimeSpan.FromDays( Double )" & _
            vbCrLf & "generates the following output." & vbCrLf )
        Console.WriteLine( "{0,21}{1,18}", _
            "FromDays", "TimeSpan" )    
        Console.WriteLine( "{0,21}{1,18}", _
            "--------", "--------" )    

        GenTimeSpanFromDays( 0.000000006 )
        GenTimeSpanFromDays( 0.000000017 )
        GenTimeSpanFromDays( 0.000123456 )
        GenTimeSpanFromDays( 1.234567898 )
        GenTimeSpanFromDays( 12345.678987654 )
        GenTimeSpanFromDays( 0.000011574 )
        GenTimeSpanFromDays( 0.000694444 )
        GenTimeSpanFromDays( 0.041666666 )
        GenTimeSpanFromDays( 1 )
        GenTimeSpanFromDays( 20.84745602 )
    End Sub 
End Module 

' This example of TimeSpan.FromDays( Double )
' generates the following output.
' 
'              FromDays          TimeSpan
'              --------          --------
'                 6E-09          00:00:00.0010000
'               1.7E-08          00:00:00.0010000
'           0.000123456          00:00:10.6670000
'           1.234567898        1.05:37:46.6660000
'       12345.678987654    12345.16:17:44.5330000
'            1.1574E-05          00:00:01
'           0.000694444          00:01:00
'           0.041666666          01:00:00
'                     1        1.00:00:00
'           20.84745602       20.20:20:20.2000000

Remarks

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 cause 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.FromDays(TimeSpan.MaxValue.TotalDays);
' The following throws an OverflowException at runtime
Dim maxSpan As TimeSpan = TimeSpan.FromDays(TimeSpan.MaxValue.TotalDays)

Applies to

See also