How to Convert Seconds to HH:MM:SS:FFF Time Format in .NET?

Convert Seconds into (Hour:Minutes:Seconds:Milliseconds) Time

To convert seconds into a formatted time string, consider the following solutions:

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:

Use the TimeSpan class with a custom format string:

TimeSpan time = TimeSpan.FromSeconds(seconds);

// backslash is essential to indicate that colon is not part of the format
string str = time.ToString(@"hh\:mm\:ss\:fff");

Important Notes:

• Ensure that the seconds value is less than the maximum allowed value for TimeSpan (TimeSpan.MaxValue.TotalSeconds) to prevent an exception.
• The format string can be customized to meet specific requirements, such as omitting hours if they are zero.

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