How can I convert milliseconds to “hhmmss” format using javascript?

Question

I am using javascript Date object trying to convert millisecond to how many hour, minute and second it is.

I have the currentTime in milliseconds

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Answer 1

If you are confident that the period will always be less than a day you could use this one-liner:

new Date(timeDiff).toISOString().slice(11,19)   // HH:MM:SS

N.B. This will be wrong if timeDiff is greater than a day.