You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.4 KiB
41 lines
1.4 KiB
var startOfDay = require('../start_of_day/index.js') |
|
|
|
var MILLISECONDS_IN_MINUTE = 60000 |
|
var MILLISECONDS_IN_DAY = 86400000 |
|
|
|
/** |
|
* @category Day Helpers |
|
* @summary Get the number of calendar days between the given dates. |
|
* |
|
* @description |
|
* Get the number of calendar days 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 days |
|
* |
|
* @example |
|
* // How many calendar days are between |
|
* // 2 July 2011 23:00:00 and 2 July 2012 00:00:00? |
|
* var result = differenceInCalendarDays( |
|
* new Date(2012, 6, 2, 0, 0), |
|
* new Date(2011, 6, 2, 23, 0) |
|
* ) |
|
* //=> 366 |
|
*/ |
|
function differenceInCalendarDays (dirtyDateLeft, dirtyDateRight) { |
|
var startOfDayLeft = startOfDay(dirtyDateLeft) |
|
var startOfDayRight = startOfDay(dirtyDateRight) |
|
|
|
var timestampLeft = startOfDayLeft.getTime() - |
|
startOfDayLeft.getTimezoneOffset() * MILLISECONDS_IN_MINUTE |
|
var timestampRight = startOfDayRight.getTime() - |
|
startOfDayRight.getTimezoneOffset() * MILLISECONDS_IN_MINUTE |
|
|
|
// Round the number of days to the nearest integer |
|
// because the number of milliseconds in a day is not constant |
|
// (e.g. it's different in the day of the daylight saving time clock shift) |
|
return Math.round((timestampLeft - timestampRight) / MILLISECONDS_IN_DAY) |
|
} |
|
|
|
module.exports = differenceInCalendarDays
|
|
|