Convert seconds to hh:mm:ss,fff format in PowerShell

Question

I have a string representing a time in seconds and milliseconds. I want to convert it to a string in the format \"hh:mm:ss,fff\".

My solution still has the flaw that

Answer 1

One line conversion :

[timespan]::fromseconds(354801857.86437).tostring()

return 4106.12:04:17.8640000