Sometimes, we may need to round off time or duration, on quarterly basis. The below table explains it better:

To round the time or duration quarterly, you first need to have the duration saved in seconds. Let’s assume that there’s a duration of 2 hours and 25 mins which we need to round off quarterly.

2 hours and 25 minutes would equal to 8700 seconds. So, the function to convert it would look like:

function getHoursAndMinsRounded(durationInSeconds) {
  const durationInMinutes = durationInSeconds / 60
  let hours = durationInMinutes / 60
  const roundedHours = Math.floor(hours)
  const minutes = (hours - roundedHours) * 60

  const h = minutes > 52 ? (hours === 23 ? 0 : ++hours) : hours
  const m = (Math.round(minutes / 15) * 15) % 60

  return `${parseInt(h.toString())}:${m.toString()}`
}

console.log(getHoursAndMinsRounded(8700))

//output
2:30
Code language: JavaScript (javascript)

The output of the above code would be 2:30. You can of course, also add zero padding if you need to. I’ve already written an article on adding zero padding here. The result would then look like 02:30 instead.