Duration Object

A duration is a way to express an amount of time that has passed. It can also be used to express a time-of-day, in other words, the amount of time that has passed since the start of the day.

FullCalendar’s API accepts durations at various points, such as slotDuration. It can be specified in one of three ways:

• an object with any of the following keys: year, years, month, months, day, days, minute, minutes, second, seconds, millisecond, milliseconds, ms.
• a string in the format hh:mm:ss.sss, hh:mm:sss or hh:mm. For example, '05:00' signifies 5 hours.
• a total number of milliseconds

The way in which FullCalendar accepts durations is rather flexible. It can be in a number of different formats with a number of different object-keys. However, when the API emits a Duration object, it is always a plain JavaScript object with just a few keys:

• years (integer)
• months (integer)
• days (integer)
• milliseconds (integer)

It’s important to note that each of these values does not include the units of the other properties. If the duration is 6 months, the year value will be 0, not 0.5. And vice-versa, if the duration is 1 years, the month value will be 0, not 12.

Also, if you want to get the hour/minute/second values of the duration, you must do division on the millisecond property.

An example that shows both Duration parsing and outputting:

var calendar = new Calendar(calendarEl, {
  slotDuration: '02:00' // 2 hours
})

var slotDuration = calendar.getOption('slotDuration')
console.log(slotDuration)

// will output...
// {
//   years: 0,
//   months: 0,
//   days: 0,
//   milliseconds: 7200000
// }

Durations with Plugins

The Duration objects that FullCalendar emits are very simple objects that don’t offer a lot of utilities to work with. If you need more power, feed one of these duration objects into a third-party library. There are already connectors written for other libs:

• Moment Plugin (for the Moment library)
• Luxon Plugin (for the Luxon library)

An example with the Moment plugin:

import { toDuration } from '@fullcalendar/moment'

var calendar = new Calendar(calendarEl, {
  slotDuration: '02:00' // 2 hours
})

var slotDuration = calendar.getOption('slotDuration')
var dur = toDuration(slotDuration) // convert to moment's type of duration

console.log(dur.humanize())
// will output "2 hours"