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Viewing file:     index.js (2.03 KB)      -rw-r--r--

import getTimezoneOffsetInMilliseconds from "../_lib/getTimezoneOffsetInMilliseconds/index.js";
import startOfDay from "../startOfDay/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
var MILLISECONDS_IN_DAY = 86400000;
/**
 * @name differenceInCalendarDays
 * @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. This means that the times are removed
 * from the dates and then the difference in days is calculated.
 *
 * ### v2.0.0 breaking changes:
 *
 * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
 *
 * @param {Date|Number} dateLeft - the later date
 * @param {Date|Number} dateRight - the earlier date
 * @returns {Number} the number of calendar days
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // How many calendar days are between
 * // 2 July 2011 23:00:00 and 2 July 2012 00:00:00?
 * const result = differenceInCalendarDays(
 *   new Date(2012, 6, 2, 0, 0),
 *   new Date(2011, 6, 2, 23, 0)
 * )
 * //=> 366
 * // How many calendar days are between
 * // 2 July 2011 23:59:00 and 3 July 2011 00:01:00?
 * const result = differenceInCalendarDays(
 *   new Date(2011, 6, 3, 0, 1),
 *   new Date(2011, 6, 2, 23, 59)
 * )
 * //=> 1
 */

export default function differenceInCalendarDays(dirtyDateLeft, dirtyDateRight) {
  requiredArgs(2, arguments);
  var startOfDayLeft = startOfDay(dirtyDateLeft);
  var startOfDayRight = startOfDay(dirtyDateRight);
  var timestampLeft = startOfDayLeft.getTime() - getTimezoneOffsetInMilliseconds(startOfDayLeft);
  var timestampRight = startOfDayRight.getTime() - getTimezoneOffsetInMilliseconds(startOfDayRight); // 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);
}