TimeSpan.FromDays Method

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Overloads

FromDays(Double)	Returns a TimeSpan that represents a specified number of days, where the specification is accurate to the nearest millisecond.
FromDays(Int32)	Initializes a new instance of the TimeSpan structure to a specified number of days.
FromDays(Int32, Int32, Int64, Int64, Int64, Int64)	Initializes a new instance of the TimeSpan structure to a specified number of days, hours, minutes, seconds, milliseconds, and microseconds.

FromDays(Double)

Source:

TimeSpan.cs

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

A number of days, accurate to the nearest millisecond.

Returns

TimeSpan

An object that represents value.

Exceptions

OverflowException

value is less than TimeSpan.MinValue or greater than TimeSpan.MaxValue.

-or-

value is PositiveInfinity.

-or-

value is NegativeInfinity.

ArgumentException

value is equal to NaN.

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.
open System

let genTimeSpanFromDays days =
    // Create a TimeSpan object and TimeSpan string from 
    // a number of days.
    let interval = TimeSpan.FromDays days
    let timeInterval = string interval

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

    printfn $"{days,21}{timeInterval,26}"

printfn "This example of TimeSpan.FromDays( double )\ngenerates the following output.\n"
printfn "%21s%18s" "FromDays" "TimeSpan"
printfn "%21s%18s" "--------" "--------"

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
let maxSpan = TimeSpan.FromDays TimeSpan.MaxValue.TotalDays

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

See also

• Double
• FromTicks(Int64)
• FromMilliseconds(Double)
• FromSeconds(Double)
• FromMinutes(Double)
• FromHours(Double)

FromDays(Int32)

Initializes a new instance of the TimeSpan structure to a specified number of days.

public:
 static TimeSpan FromDays(int days);

public static TimeSpan FromDays (int days);

static member FromDays : int -> TimeSpan

Public Shared Function FromDays (days As Integer) As TimeSpan

Parameters

days

Int32

Number of days.

Returns

TimeSpan

Returns a TimeSpan that represents a specified number of days.

Exceptions

ArgumentOutOfRangeException

The parameters specify a TimeSpan value less than MinValue or greater than MaxValue

FromDays(Int32, Int32, Int64, Int64, Int64, Int64)

Initializes a new instance of the TimeSpan structure to a specified number of days, hours, minutes, seconds, milliseconds, and microseconds.

public static TimeSpan FromDays (int days, int hours = 0, long minutes = 0, long seconds = 0, long milliseconds = 0, long microseconds = 0);

static member FromDays : int * int * int64 * int64 * int64 * int64 -> TimeSpan

Public Shared Function FromDays (days As Integer, Optional hours As Integer = 0, Optional minutes As Long = 0, Optional seconds As Long = 0, Optional milliseconds As Long = 0, Optional microseconds As Long = 0) As TimeSpan

Parameters

days

Int32

Number of days.

hours

Int32

Number of hours.

minutes

Int64

Number of minutes.

seconds

Int64

Number of seconds.

milliseconds

Int64

Number of milliseconds.

microseconds

Int64

Number of microseconds.

Returns

TimeSpan

Returns a TimeSpan that represents a specified number of days, hours, minutes, seconds, milliseconds, and microseconds.

Exceptions

ArgumentOutOfRangeException

The parameters specify a TimeSpan value less than MinValue or greater than MaxValue