DateTimeOffset.ToUnixTimeSeconds() Method in C#

DateTimeOffset.ToUnixTimeSeconds Method is used to return the number of seconds that have elapsed since 1970-01-01T00:00:00Z. Before returning the Unix time, this method will convert the current instance to the UTC. And also, it will return a negative value for the date and time values before 1970-01-01T00:00:00Z.

Syntax: public long ToUnixTimeSeconds (); 

Return Value: This method return the number of seconds that have elapsed since 1970-01-01T00:00:00Z.

Below programs illustrate the use of DateTimeOffset.ToUnixTimeSeconds() Method: 

Example 1:

csharp

// C# program to demonstrate the
// DateTimeOffset.ToUnixTimeSeconds()
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // creating object of  DateTimeOffset
        DateTimeOffset offset = new DateTimeOffset(2017,
                6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));

        // Returns the number of seconds
        // that have elapsed since 1970-01-01T00:00:00Z.
        // instance using ToUnixTimeSeconds() method
        long value = offset.ToUnixTimeSeconds();

        // Display the time
        Console.WriteLine("Returns the number of"+
                         " seconds : {0}", value);
    }
}

Output:

Returns the number of seconds : 1496321700

Example 2:

csharp

// C# program to demonstrate the
// DateTimeOffset.ToUnixTimeSeconds()
// Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        // creating object of  DateTimeOffset
        DateTimeOffset offset = new DateTimeOffset(2017,
                6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));

        // Returns the number of seconds
        // that have elapsed since 1970-01-01T00:00:00Z.
        // instance using ToUnixTimeSeconds() method
        long value = offset.ToUnixTimeSeconds();

        // Display the time
        Console.WriteLine("Returns the number of"+
                         " seconds : {0}", value);
    }
}

Output:

Returns the number of seconds : 1496321700

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.datetimeoffset.tounixtimeseconds?view=netframework-4.7.2