A TimeSpan value can be represented as [-]d.hh:mm:ss.ff, where the optional minus sign indicates a negative time interval, the d component is days, hh is hours as measured on a 24-hour clock, mm is minutes, ss is seconds, and ff is fractions of a second. The value of the TimeSpan.Seconds property is the seconds component, ss.

The TimeSpan.Seconds property represents whole seconds, whereas the TimeSpan.TotalSeconds property represents whole and fractional seconds.

This example demonstrates using the TimeSpan.Seconds property.

using System;
public class TimeSpanPropertiesExampleOne {
   public static void Main() {
      TimeSpan ts = new TimeSpan((Int64)10e12+3456789);
      Console.WriteLine(ts.ToString());
      Console.WriteLine("Seconds: {0}", ts.Seconds );
   }
}

The output is