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DateTimeOffset.ToUnixTimeSeconds Method

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Definition

Namespace:
System
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
DateTimeOffset.cs
Source:
DateTimeOffset.cs
Source:
DateTimeOffset.cs

Returns the number of seconds that have elapsed since 1970-01-01T00:00:00Z.

public:
 long ToUnixTimeSeconds();
public long ToUnixTimeSeconds ();
member this.ToUnixTimeSeconds : unit -> int64
Public Function ToUnixTimeSeconds () As Long

Returns

Int64

The number of seconds that have elapsed since 1970-01-01T00:00:00Z.

Examples

The following example calls the ToUnixTimeSeconds method to return the Unix time of values that are equal to, shortly before, and shortly after 1970-01-01T00:00:00Z.

using System;

public class Example
{
   public static void Main()
   {
      DateTimeOffset dto = new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero);
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds());

      dto = new DateTimeOffset(1969, 12, 31, 23, 59, 0, TimeSpan.Zero);
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds());

      dto = new DateTimeOffset(1970, 1, 1, 0, 1, 0, TimeSpan.Zero);
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds());
   }
}
// The example displays the following output:
//    1/1/1970 12:00:00 AM +00:00 --> Unix Seconds: 0
//    12/31/1969 11:59:00 PM +00:00 --> Unix Seconds: -60
//    1/1/1970 12:01:00 AM +00:00 --> Unix Seconds: 60

open System

[<EntryPoint>]
let main _ =
    let dto = DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero)
    printfn $"{dto} --> Unix Seconds: {dto.ToUnixTimeSeconds()}"

    let dto = DateTimeOffset(1969, 12, 31, 23, 59, 0, TimeSpan.Zero)
    printfn $"{dto} --> Unix Seconds: {dto.ToUnixTimeSeconds()}"

    let dto = DateTimeOffset(1970, 1, 1, 0, 1, 0, TimeSpan.Zero)
    printfn $"{dto} --> Unix Seconds: {dto.ToUnixTimeSeconds()}"

    0
// The example displays the following output:
//    1/1/1970 12:00:00 AM +00:00 --> Unix Seconds: 0
//    12/31/1969 11:59:00 PM +00:00 --> Unix Seconds: -60
//    1/1/1970 12:01:00 AM +00:00 --> Unix Seconds: 60

Module Example
   Public Sub Main()
      Dim dto As DateTimeOffset = New DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero)
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds())

      dto = New DateTimeOffset(1969, 12, 31, 23, 59, 0, TimeSpan.Zero)
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds())

      dto = New DateTimeOffset(1970, 1, 1, 0, 1, 0, TimeSpan.Zero)
      Console.WriteLine("{0} --> Unix Seconds: {1}", dto, dto.ToUnixTimeSeconds())
   End Sub
End Module
' The example displays the following output:
'       1/1/1970 12:00:00 AM +00:00 --> Unix Seconds: 0
'       12/31/1969 11:59:00 PM +00:00 --> Unix Seconds: -60
'       1/1/1970 12:01:00 AM +00:00 --> Unix Seconds: 60

Remarks

Unix time represents the number of seconds that have elapsed since 1970-01-01T00:00:00Z (January 1, 1970, at 12:00 AM UTC). It does not take leap seconds into account.

This method first converts the current instance to UTC before returning its Unix time. For date and time values before 1970-01-01T00:00:00Z, this method returns a negative value.

Applies to

See also