How Can I Convert Seconds to HH:MM:SS:fff Format in .NET?

Converting Seconds to (Hour:Minutes:Seconds:Milliseconds) Format

When working with time-related calculations in .NET, you may encounter the need to convert seconds into a human-readable (Hour:Minutes:Seconds:Milliseconds) format.

SOLUTION:

For .NET <= 4.0:

• Utilize the TimeSpan class:

  TimeSpan t = TimeSpan.FromSeconds(secs);
  
  string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms", 
                t.Hours, 
                t.Minutes, 
                t.Seconds, 
                t.Milliseconds);

For .NET > 4.0:

• Leverage the TimeSpan class with the custom format string:

  TimeSpan time = TimeSpan.FromSeconds(seconds);
  
  // Backslash is necessary to escape the colon character
  string str = time.ToString(@"hh\:mm\:ss\:fff");

Caution:

• Ensure that the input value seconds is within the bounds of TimeSpan.MaxValue.TotalSeconds to avoid exceptions.

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