Convert milliseconds to human readable time lapse

What about this?

var ts = TimeSpan.FromMilliseconds(86300000 /*whatever */);
var parts = string
                .Format("{0:D2}d:{1:D2}h:{2:D2}m:{3:D2}s:{4:D3}ms",
                    ts.Days, ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds)
                .Split(':')
                .SkipWhile(s => Regex.Match(s, @"00\w").Success) // skip zero-valued components
                .ToArray();
var result = string.Join(" ", parts); // combine the result

Console.WriteLine(result);            // prints '23h 58m 20s 000ms'

You could utilize the static TimeSpan.FromMilliseconds method as well as the resulting TimeSpan's Days, Hours, Minutes, Seconds and Milliseconds properties.

But I'm busy right now, so I'll leave the rest to you as an exercise.

I know this is old, but I wanted to answer with a great nuget package.

Install-Package Humanizer

https://www.nuget.org/packages/Humanizer

https://github.com/MehdiK/Humanizer

Example from their readme.md

TimeSpan.FromMilliseconds(1299630020).Humanize(4) => "2 weeks, 1 day, 1 hour, 30 seconds"

You can use TimeSpan class, something like this:

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

It's quite similar as this thread I've just found:

What is the best way to convert seconds into (Hour:Minutes:Seconds:Milliseconds) time?