33 lines
1 KiB
JavaScript
33 lines
1 KiB
JavaScript
var getQuarter = require('../get_quarter/index.js')
|
|
var parse = require('../parse/index.js')
|
|
|
|
/**
|
|
* @category Quarter Helpers
|
|
* @summary Get the number of calendar quarters between the given dates.
|
|
*
|
|
* @description
|
|
* Get the number of calendar quarters between the given dates.
|
|
*
|
|
* @param {Date|String|Number} dateLeft - the later date
|
|
* @param {Date|String|Number} dateRight - the earlier date
|
|
* @returns {Number} the number of calendar quarters
|
|
*
|
|
* @example
|
|
* // How many calendar quarters are between 31 December 2013 and 2 July 2014?
|
|
* var result = differenceInCalendarQuarters(
|
|
* new Date(2014, 6, 2),
|
|
* new Date(2013, 11, 31)
|
|
* )
|
|
* //=> 3
|
|
*/
|
|
function differenceInCalendarQuarters (dirtyDateLeft, dirtyDateRight) {
|
|
var dateLeft = parse(dirtyDateLeft)
|
|
var dateRight = parse(dirtyDateRight)
|
|
|
|
var yearDiff = dateLeft.getFullYear() - dateRight.getFullYear()
|
|
var quarterDiff = getQuarter(dateLeft) - getQuarter(dateRight)
|
|
|
|
return yearDiff * 4 + quarterDiff
|
|
}
|
|
|
|
module.exports = differenceInCalendarQuarters
|