using System;
public class Test
{
public static void Main()
{
TimeSpan t = TimeSpan.FromSeconds( 121 );
string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms",
t.Hours,
t.Minutes,
t.Seconds,
t.Milliseconds);
Console.Write(answer);
}
}
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