how to use the formatisoduration function from date-fns in javascript

The formatISODuration function from date-fns is a utility function that allows you to format a duration in ISO 8601 format. Here's how you can use it:

index.tsx
const { formatISODuration } = require('date-fns')

const duration = {
  years: 1,
  months: 2,
  weeks: 3,
  days: 4,
  hours: 5,
  minutes: 6,
  seconds: 7,
  milliseconds: 8
}

const formattedDuration = formatISODuration(duration)

console.log(formattedDuration)
// Output: "P1Y2M3W4DT5H6M7.008S"
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In the above code, we import the formatISODuration function from date-fns. We then create a duration object with various properties representing time units (years, months, weeks, etc.) that we want to format. We then use the formatISODuration function to format the duration, and the resulting string is stored in the formattedDuration variable. Finally, we use console.log to output the formatted duration to the console.

The output in the above example is a string representing the duration in ISO 8601 format, with the P indicating a duration, followed by the number of years, months, weeks, days, hours, minutes, and seconds in the duration, separated by various letters (Y for years, M for months, etc.), and a T separator between the days and time components. The duration also includes the fractional amount of seconds (in this case, 0.008S) represented by the milliseconds property of the duration object.